Look where your t-bars end under the cab. There may be a cover over it if so take it off. Then you see a bolt hanging down just give it a few turns till you get the truck where you want it. The right and left sides are different for how much lift you'll get out of a turn. The left side sets it and the right side just lifts it. You should have to turn your left side to far. The right side you'll run pretty much all the way up.
I'd count the treads on both before you do so you know where it was if you have a problem or ever want to put it back to stock.
it is a 1/2 or 13mm head. turn em a few turns at a tome, both sides equally until you are happy, they are right at the rear of the torsion bars. make sure you dont overadjust the drivers side, because the passenger side bolt is shorter