On YouTube’s main menu, press the X button to search for videos. When searching, press the Y button to add a space, and the B Button to delete a character.
Browse videos: As you search, relevant videos will appear at the bottom of the screen. Press left or right on the D-pad or left stick to browse the video results.
Edit your search query: Press the X button again or click on the keyboard icon to open up the keyboard for typing.
Note: The touch screen feature works with Search keyboard when the device is used in handheld mode.