Here are the steps to install the Yippee app on your Apple TV if you are already a subscriber:
Please note that at this time, no subtitles work on Apple TV unless the subtitles are a part of the source file itself.
The "My List" function is located under "Library," which is at the top of the app. As a subscriber, you can add titles to the list by clicking and holding on the title until a new window pops up. That window should allow you to add the title to "My List."