Where is my Youtube app?

New here. Coming from Windows Media Center, I purchased a Roamio Basic last September and have been enjoying it. I have been using the DVR functions and no apps. I looked for youtube app and it is not there? (Went to Tivo>Finde TV, Movies, & Videos and I find HBOgo and Hulu and no more. I believe that where Youtube should be located.

Do I need to download or do something in order to get the app to appear.

Thanks!