Share Apple TV with multiple users
It’s easy to share Apple TV with multiple family members. When each member in a household has an Apple ID, switching member profiles on Apple TV creates a custom experience, with Up Next lists, music, Game Center data, and content recommendations personalized for the currently active user.
Note: Changing users does not change the Apple ID used for iCloud. To change your iCloud account, open Settings 
on Apple TV and go to Users and Accounts > iCloud.
Switch the account used to purchase movies, TV shows, and apps
On Apple TV, do either of the following:
Open Settings
, go to Users and Accounts > Current User, then select a name from the list and sign in to that account.Open tvOS Control Center, then select the name of a different family member. (See Use tvOS Control Center on Apple TV for details.)
Only one user at a time can be active on the Apple TV.
Change an iCloud account
Open Settings
on Apple TV.Go to Users and Accounts > iCloud > Sign Out, then select Sign In and enter a new Apple ID.
Change a Game Center account
Open Settings
on Apple TV.Go to Users and Accounts > Game Center > Sign Out, then select Sign In and enter a new Apple ID.