You can download Fanatiz on your Apple TV through the App Store on your device by following these steps:
Open the App Store on your Apple TV.
Select the app.
Click on "Obtain".
You may have to enter your password. Once entered, the app will be downloaded.
If you are subscribed, you will be able to watch Fanatiz content right away.
*It is not possible to subscribe through Apple TV. The app only works to stream content. If you are not subscribed, please check how to subscribe.