From the Home screen, tap the Apps icon (in the QuickTap bar) > the Apps tab (if necessary) > YouTube .
Search for and tap a video to watch it.
Tap the Menu icon (at the upper-right corner of the screen) for the YouTube Options menu (Settings, Send feedback, Help, and Sign in/out).
Tap the YouTube icon (at the upper-left corner of the screen) to toggle between What to Watch and other YouTube options.