Rapid Tap

I just bought a 2004 gx470 and am trying to get the rear dvd to work for the grand kids. Whenever I insert a dvd, the rear screen show the intro but also has a DVD Hint screen on it that says touch the front screen or to hit the cursor on the remote. I'm not sure if the remote works but which screen do I touch on the front screen? If I have to be on the dvd screen on the front, how do I get to that screen on the front? Thanks, Bob