In the Zattoo app on Apple TV, favorites cannot be managed. Please configure your list of favorites at zattoo.com or in your mobile app. This is how your list will show your favorites on Apple TV:
1. Settings > Channel List > Favorites
2. In Live TV > Swipe up on Touch surface.
In a future app version, favorites will be manageable on Apple TV. We will keep you updated as soon as there is any more news about it.