Download the Amazon Appstore on your tablet. On a computer? Learn more about how to Install Appstore on your Android tablet.
Go to your device's Settings, select Security or Applications (depending on device), and then check the Unknown Sources box. What's this?
Launch Amazon Appstore from Notifications or Downloads, tap Install when prompted, and then sign in with your Amazon account email address and password.
Tap the Install button for Amazon Video. Open Amazon Video when installation is complete.