How do you adjust the windage on a PU scope so that your no wind zero equals zero on the windage knob?

 

Is it the small screw on the right side of the scope?

depending on which way it has to go you can either put a shim in the back or file the back

To zero out the windage if the crosshair is where you want it you just loosen the 2 screws on the top of the cap and rotate the silver ring to the desired position.  Once there tighten the screws down.  If you need to move the crosshairs but still keep them centered in the scope you need to do some filing on the bottom feet of the mount.