So I am very new to owning rifles and have never had to zero a scope before. I have a Leupold VX-III like the title says, and I just got it zeroed to 100 yds, but I can't seem to figure out how to zero the turrets??? If that makes sense. I bought it from a friend and it did not come with a manual, although I looked up the manual online. The pictures in the manual don't correspond to my scope. Any help would be greatly appreciated.