How-to: Activate Multiple Profiles on Apple TV
Multiple Profiles allows you to share you WatchAid application with multiple people. The pre-requisite is that each users needs to have its own WatchAid install on a personal iOS device.
Start with going to the Setting on your Apple TV: Settings->Apps->WatchAid and turn on Multiple Profiles
Launch the WatchAid application on your Apple TV, go to the new menu Profiles and select (+) to add a user to you Apple TV
On the person device (iPhone/iPad), open WatchAid, go to Settings and select "Multiple Profiles on Apple TV" then click on Scan QR Code
Once the new profile was added, you can go ahead and customize it.
When you want to switch from a profile to another, just go to Profile and select the person in the list.