Guys,
There are 2 adjustment screws on each headlight. One is for vertical aiming and the other is for horizontal. The one shown in the pdf is the vertical adjuster, although the diagram is a bit confusing. It is located at the bottom rear of the headlight assembly.
The screw that mxsjw is showing with the cap on it is for horizontal adjustment. You usually don't have to adjust this setting.
Here is the vertical adjuster... you just use a long phillips screwdriver to adjust it. There is a groove that guides the screwdriver down the the adjuster screw.
