Visit the Play Store on your Android TV main menu.
Find the search field and type "Festiva TV & Radio"
The Festiva TV & Radio app should appear in the results. Please click on the icon.
Click on the Download button to install the application.
Launch the app and you will now be prompted to enter your account information. If you have not created an account yet, you must do so at the Sign Up page first.
Once your account is created, you should be able to sign in using the email address and password you provided during the registration. Enjoy!