Insert the Measuring Tool (B) in between Bracket (C) and the frame to ensure the recommended distance away from the frame.
Mount both Brackets (C) with provided self-threading Screws (D) using a screw driver.
(In less likely situation if a stud is not present behind the drywall, you might need to use drywall anchors. If you have metal other than aluminum on the top, use a drill bit - smaller than your screws - to drill pilot holes through your bracket marks.)