Turn on your Apple TV (4th Generation) and open the App Store.
Search for the name of the app you are looking for (HIT IT GREAT).
Install it on your Apple TV.
Once installed, open the app and click the Sign In button.
The app will provide you with an activation code.
On a computer or mobile device, visit the activate page, sign in (if you are not), and enter that code.
The app will then refresh, and you will be able to watch the video content.
Please note that at this time, no subtitles work on Apple TV unless the subtitles are a part of the source file itself.