The first thing to commit to memory is FORS. This stands for Front Opposite, Rear Same. When you want to move the point of bullet impact on the target, you move the front sight in the OPPOSITE direction or you move the rear sight in the SAME direction.
Adjust the rear sight in the direction that you want the bullet group to move. In other words, if the gun is shooting to the left of where you are aiming, you will want to move the bullet group to the right. Move the rear sight to the right and your group will follow. The same applies to any direction. Move the rear sight higher and the gun puts its bullets higher. Move the rear sight down and the group moves down. Move the sight left and the bullets move left. This rule is universal and applies to all rifles, handguns, and slug shotguns. The rule to remember is this: The bullet group follows the movement of the rear sight.
Move the rear sight in the direction you want the bullet to go. For example, if you're shooting low, raise the rear sight. If you're shooting left, move the rear sight to the right.