I want to register my new Fire tablet, but my Amazon password is rejected, even though I ordered the fire through Amazon...hello ?! Heeeeelp!

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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

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 .

hello,
You can change your Fire tablet's lock screen password or PIN directly from Manage Your Content and Devices.

1. Manage Your Content and Devices, and then select Your Devices.
2. From the list of devices registered to your Amazon account, select your Fire tablet.
3. Select the Device Actions drop-down menu, and then select Remote Lock.
4. Enter and then confirm a new password or PIN, and then select Lock Device.
5. From your Fire tablet, tap Unlock Device.
6. Swipe in from the right edge of the screen to unlock your device. Enter your lock screen password or PIN, and then tap OK.

Goodluck!!!!!!!!!!!!!!

Make amazon account on Your Account
To register fire TV

-Select settings from fire TV menu
-Go to my account (if your device isn't registered, register option will appear. Select register and enter amazon account information when prompted)

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 can do both from your fire. Just follow this.
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.

Direct from online directions:
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 .

Try this, the process is the same for all the Amazon tablets:
Register Your Kindle Fire