If you are trying to raise the light to point higher, you can't. There is only a small range it can be adjusted up and down because hids blinds opposite traffic. Aside from the adjuster on the light itself and the dial on the left side of the dash that is it. It is a little lower than I would like it to be but its set up that way intentionally.
In your case, sounds like you may have busted the adjusting screw. Is the light loose now? Does it bounce all the time when you drive at night?