How to Switch Amazon Accounts on Fire TV
When you first setup your Amazon Fire TV, you are required to register an account. Fortunately, if you need to switch your account for any reason, Amazon has made it very easy to do so. Follow these quick steps to switch to a different Amazon account.
Navigate to the "Settings" section.
Navigate to the right until you've reached the "My Account" setting and press select.
Press select on the "Amazon Account" option.
Press select on "Deregister".
Navigate to the "Deregister" button and select it.
Please wait while your device is deregistered.
Select "I already have an Amazon account"
Take note of the web page and code on the screen.
On your computer or phone, visit amazon.com/code and login to the Amazon account you want to associate the Fire TV device to.
On the next page, enter the code displayed on your TV and select "Continue".
Your device will now be registered to your chosen Amazon account.