HOW DO i unsubscribe from a program on apple tv

You can unsubscribe from subscriptions channels (content providers), but not specific programs (shows).

If you want to cancel a subscription from Apple - Apple Support

You can remove shows from Up Next, so that the show’s episodes do not show there anymore.

Remove an item from Up Next - Explore Watch Now in the Apple TV app - Apple Support

If you watch supported shows at a later time, then they may be added to Up Next again automatically.