How do i display graphics on the touch screen?

First, you need to specify the screen mode you'll use with XSCREEN. I suggest starting with XSCREEN 3. After that, you can change the active drawing screen to be the touchscreen by specifying DISPLAY 1. You can return to the top screen at any time by specifying DISPLAY 0. After calling DISPLAY 1, you can draw on the bottom screen exactly as you would on the top screen.

Thanks!