To register the account, do you use your Amazon account password? Old Kindle account password? email password?

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To buy content and deliver it to your device, you will need to connect to a wireless network and register your Fire tablet to an Amazon account.
If you are setting up a new Fire tablet for the first time, you'll be taken through setup instructions and will have the chance to register your device. Follow the instructions on your screen.
To register your Fire tablet outside of the initial setup screens:

1. From Home, swipe down from the top of the screen and then tap Settings.
2. Tap My Account.
3. Tap Register.
   • If you already have an Amazon account: Enter your Amazon account information, and then tap Continue.
   • If you do not have an Amazon account: Tap Start Here, and then follow the instructions to set up a new account.

Note: If you've forgotten your Amazon account password, you can reset it by requesting that a personalized "password reset" link be sent to your e-mail address. To learn more, go to Reset Your Account Password .
If you need to deregister your device from an Amazon account, follow the steps above, and then tap Deregister. After you deregister your device from an Amazon account, you won't be able to access items stored in the Cloud for that account.
After deregistering, you can register your Fire tablet to another Amazon account. Related Help Topics

• About Wireless Display Methods for Amazon Devices

Hello
Register Your Kindle

1.From Home, tap the Menu icon, and then tap Settings.
2.Tap my account.
3.Choose the Amazon account you want to use on your Kindle: If you already have an Amazon account: Tap this option. Enter your Amazon account information. Tap Register. Your name will appear as the Registered User when registration is complete.

For any help or support just visit us: www Kindle Com Support

To enlist your Kindle Fire tablet
Access the fast settings menu by swiping down from the highest point of the screen
Tap Settings symbol
Tap My Account
Tap Register
Tip: Tap the Fire Generation 8, Fire OS 5, Fire Gen 8, Register Fire Gen 8 key to enter numbers or images. Tap the ABC key to come back to the consistent console. Tap the Shift key (up bolt) for capitalized letters. Tap the crate beside Hide secret word to show your watchword as you write.
Whenever completed, tap Register once more. Your name will show up as the enrolled client.
Click here for more information
Kindle Fire Troubleshooting

You would need to deregister the device from the new email address/account and register it to your old address/account, the one that has the rest of your books.

Once registered to your previous account you will be able to take advantage of the Kindle Owner's Lending Library feature.
Here's more information on it: http://www.amazon.com/gp/help/customer/display.html?nodeId=200757120


Once you've registered your Kindle to your own Amazon account you may still be able to access any books on your previous account if you can take advantage of the Family Library option. Information here:

http://www.amazon.com/gp/help/customer/display.html/ref=help_search_1-1?ie=UTF8&nodeId=201630380&qid=1425455853&sr=1-1

To register your new kindle you need to go to http://www.amazon.com/s?ie=UTF8&page=1&rh=i%3Aaps%2Ck%3Akindle%20registration and follow the directions.

Register Your Kindle Register your Kindle to your Amazon account to buy and deliver Kindle content to your device.

To buy and deliver Kindle content, you'll need to connect wirelessly and register your Kindle to an Amazon account. Registering also allows you to transfer purchases between Kindle devices and Kindle reading apps.

1. From Home, press the Menu button, and then select Settings. Select Registration.
2. Specify the Amazon account you want to use for your Kindle:
   • If you already have an Amazon account: Select this option. Enter the e-mail and password associated with your Amazon account. Select Register. Your name will appear as the Registered User when registration is complete.
   • If you do not have an Amazon account: Select this option and follow the on-screen instructions to set up a new Amazon account.

Having trouble?

• Kindle is Registered to a Different Account

You can re-register your Kindle through the device itself. Go to the "Settings" menu, select "Register," and then enter your Amazon account email address and password to connect your device to your account. If you do not have an Amazon account, you are prompted to create one.
Can You Re Register After Deregistering on Kindle The Classroom Synonym

First, you need to deregister the Kindle from the old account.

Deregistering will retain the already downloaded books on the E-Ink devices but wipes all purchased content tied to the old account from e.g. Kindle Fire. You cannot restore books from the cloud anymore you purchased on the old account and access to the shop is blocked until the device is registered again. Other Kindle's on the same account and the account itself remain unaffected.

You can do the deregistration from the Kindle's settings menu --> Registration or alternatively from an Amazon web site:

Log in to http://kindle.amazon.com using the old credentials (email + password).

Next, select "Manage Your Kindle" from menu that opens when you hover the mouse over the "Hello, <Name>" link in the upper right corner of the page.

Click on the center tab "Your Devices" and review the list of Kindle devices and software readers tied to your account. Select the device to deregister and click on "deregister" below.

To register the Kindle to a new account, go online with the Kindle, and follow the registration procedure callable from the settings menu. Find a detailed description on
http://www.amazon.com/gp/help/customer/display.html?nodeId=201242220

When you register your Kindle, you'll be able to purchase and download content easily. You can register or deregister your Kindle on your computer through the Manage Your Kindle page, or right from your device.
Note: If you have a Wi-Fi only device, you will need to set up your Wi-Fi connection in order to register from your device.

To register or deregister your Kindle from your device:

1. Move the 5-way controller down until "Settings" is underlined and press to select.
2. Press the 5-way controller to select "register" or "deregister" from the Settings screen. If you don't have an Amazon.com account, you will be prompted to create one.
3. When you register your Kindle, enter your Amazon.com user name and password (the e-mail address and password associated with your Amazon account) using the keyboard.
4. Move the 5-way controller to select "OK."

Tip: If your Amazon user name or password contains characters or numbers not present on the Kindle keyboard, press the Symbol key to see a menu of additional characters.
Registering if You Don't Have an Amazon.com Account If you don't already have an Amazon.com account, you can create one at www.amazon.com. Here's how:

1. On the sign-in screen, enter the e-mail address you want to use for your Amazon.com account. This e-mail address will be the one we use to send you updates about your orders.
2. Don't enter a password. Check the button next to "No, I am a new customer" and then click the Sign in using our secure server button to continue.
3. Enter your name and verify your e-mail address on the Registration screen.
4. Enter a password for your new account and click the Continue button. We'll ask you to enter the same password twice to make sure it is correct. (You might also want to write your login informaiton so you'll have it later.)
5. Visit the Manage Your Kindle page. Enter the serial number for your Kindle and click the Register a new Kindle button. You'll find Kindle's serial number on the outside of the box or on the Settings menu on your Kindle.

If you're unable to locate Kindle's serial number, don't worry. You've successfully created an Amazon.com account and can now register your Kindle wirelessly following the Registering Your Kindle instructions above.