Cannot sign in on emails ?

Use the browser and go to the gmail login page. That way their info isn't stored on your tablet and none of your stuff gets changed.

What tablet are you using? Have you tryed uninstalling and reinstalling apps that this proplem is happening in? If yes then have you tryed looking at the setting of the programs to make sure they are right? If all this has failed... Have you tryed resetting your tablet? What app are you using for email and messages? If you have a backup app use that before you attempt anything.

To reset your password, enter the email address you use to sign in toGoogle. This can be your Gmail address, your Google Apps email address, or another email address associated with your account. Enter the username you use to sign in to Google.


Google Account Recovery

https://www.google.com/accounts/recovery/ Google

For amazon account password.
Sign on to Amazon. com When the sign on page comes up it has a link for "forgot my password" Follow the info to reset you password.
For device password
Once signed in place cursor on Your account. It will bring up a list. Select manage content and devices, That will take you to a page that shows book you have, devices and settings. Click devices. If your device does not show it is unregistered. The device has it's own password that you create during registration. Go back to device and complete registration. If any problems go back to "Your Account" and choose your account from list. On right side look for Kindle help home. The next page on left click Contact Us. Fill in info and they will email or call you with needed help.

Restart machine or phone and retry...sometimes you need to let it download especially with attachments...if the phones is updating something else at the time thus can cause partial emails to become corrupted..normally emails remain in the isp server so you can go online via a browser ..sign in to your provider and read it from there.

what kind of tablet do you have, Ipad depends on the version and what program you are trying to use to sign pdf?

I’m happy to help further over the phone at https://www.6ya.com/expert/jason_66344e9ad974c715

To sign in on a Kindle you (1) must be connected to the Internet via WiFi or wireless, and (2) must have an account in good standing with Amazon. If both of these conditions are true and you are still unable to sign in (using a correct password), then your Kindle may be blacklisted.
If your Kindle has been blacklisted then you will need to hack the firmware before you will be able to register the device, but that is beyond the scope of this Answer!

It's easy, go to gmail.com and create an account. Under settings/ user settings on the tablet put the gmail email and her password.

Which email service? Usually if you click on your avatar or on a little gear icon in the upper right, you'll have a "Log out" or "Sign out" or similar option.

You need the password that was set on it to open the laptop.