There are a couple of different styles. One has a knob that you unscrew, move the awning to the desired pitch, and tighten the knob back down.
The other style has a double bar on a roller that moves up as you extend the awning. On the inside bar, you will see a silver button and several holes. Depress the button and the slide to the desired pitch. Look for a red label on this arm. It will give you instructions on having the awning pitched differently on each end.
If you do a forum search for awnings, you should find pictures of the different types.
Here is some info on the second type.
http://www.keystonerv.org/forums/sho...tilting&page=2