Those are 2 screws for windage adjustment on the rear ie loosen one side then tighten the other to shift it. Shift to the right and the point of impact will go to the right (loosen right screw, tighten left screw). Not sure of the amount of adjustment per turn of the screw.
Similar principle for the front sight height adjustment except both screws are in front (loosen one, tighten the other). I'm not sure which way is which but shifting the sight up will lower the point of impact.