macOS Catalina 10.15
Manage subscriptions in the Apple TV app on Mac
In the Apple TV app, you can modify or cancel subscriptions for Apple TV channels such as STARZ and HBO.
Manage your subscriptions
In the Apple TV app
on your Mac, choose Account > View My Account, then sign in.In the Account Information window, scroll down to the Settings section.
Click the Manage link next to Subscriptions, then follow the onscreen instructions to change or cancel your subscriptions.