watch appleTV on firestick
I have downloaded the app on the firestick in Canada How do I watch content?
FireTVStick(Gen2),
Question marked as
Sign in to the app with your Apple ID account.
Sign in to the Apple TV app - Get started - Apple TV App User Guide - Apple Support
Then you can access iTunes Store movies that you have previously bought or rented, or watch Apple TV app Channels that you subscribed to (including Apple TV+).
Note that you can’t subscribe or make purchases for Apple services on Fire TV devices. You will have to do that step on a different device.