How to Logout AMAZON account from all Devices?
Go to the Manage Your Content and Devices page. Select your device or app from the Devices tab. Next to the current name, select Edit. Enter a new name and choose Save when finished.
There are a number of options on the right side under the menu “my account” when you click on “Manage Content and Devices.” It will take you to your library where you can remove items, update books, resend content, manage documents, and so on.