Greetings.

Here are a few numbers, to add to the several useful posts that actually show you where the two bolts are:

Adjusting one headlight (drivers side in this case)
12 full turns, both bolts (I did 4 lots of 3 full turns each) +
Clockwise ('doing up' the bolt) =
Lowered the beam 3.5" at a distance of 4 feet from the back of the light to the wall in front of the car.

You can draw a level line on the wall to help out.