I assume you're talking about the vertical adjustment. The shop manual isn't very clear on this. Take the windshield off. From the front of the bike, facing the rear of the bike, look straight down. On the right side of the internal plastic you'll see what looks like a "D" shaped hole, with little silver teeth at the back (the straight side of the "D".) Stick a phillips screwdriver in, and turn. and turn. and turn. (Really, it takes a whole lot of revolutions.) I don't remember if clockwise is up or down - you'll have to see where it moves where the headlight shines on a wall.