First, Welcome Aboard. Unless you have a non-US market gun, or other non-standard rear sight, there should be 2 adjustment screws on the right side of the rear sight. The rear, or left screw, should be for elevation, and the front, or right screw, for windage. Right is UP or Right, and Left is Down or Left. Its been a long time since I made adjustments, so I might have the directions wrong, but you should see the direction of travel, and adjust accordingly.