I think you move the bracket to the passenger side to raise it and the driver side to lower. If you find a picture of the Metco Watts link, you will see a black bracket. There are two nuts to loosen. I forget the sizes. One is larger than the other. The smaller one is welded to the bracket. Do not over tightent this one or it will snap. Believe me, I've done it before on the OEM.
The larger but is on a bolt and you will need another wrench on the other end to hold it still to loosen and tighten that end of the bracket. Move the bracket in small increments and drive it around to make sure the air bags settle. I'm guessing a 1/4 on the bracket is about an inch on the air bags.