Follow the steps below to register your device to Amazon Prime Video service at www.amazon.com/mytv and primevideo.com/mytv 

1.Using the remote supplied with the Internet device, press the Home button.
2.Select Amazon Video icon located under Featured apps.
3.From the Amazon Video app, select Register on the Amazon website.
4.Using a computer, go to http://primevideo.com/mytv.
5.Sign-in with an active e-mail address and password or click Create your Amazon account.
6.Use the code written down on step 3 to link the device with the Amazon account. 
Select Continue.
7.A confirmation message appears on the TV screen if registration is successf
8.Select Continue.
9.Select Continue on your TV Amazon Video app to enjoy Amazon Prime Video.