From the AA web site.
http://advantagearms.hostasaurus.com/mm5/GlockSightAdjustment2.pdf
If you want poi to move to the left (or right) move the sight to the left (or right).
As far as raising or lowering, you can turn the screw either way, at least on my kits you can (also on my 17L). You have to watch the rear sight to see if it's going up or down. If you want poi higher, raise the sight.
It's not the greatest adjustable sight, but the Glock adjustable sight mainly adjusts thru the range of factory available fixed sights. 6.1 mm, 6.5mm, 6.9mm and 7.3mm..
This page from GlockParts.com tells you what they are for.
http://glockparts.com/Products.aspx?CAT=742
Dave