From the Home screen, tap the Apps icon (in the QuickTap bar) > the Apps tab (if necessary) > YouTube
.
Search for a video you want to watch, then 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 access What to Watch and other YouTube options.