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.