Align the mirror support rails (#3) to the pre-drilled holes along the back sides of the mirror (#1). Insert 3 screws (#A) into each rail and secure using a Phillips screwdriver. Note: Make sure the line along the rails align with the bottom of the mirror (#1). Carefully place the mirror (#1) onto the dresser (#2). Align the bottom half of the rails to the pre-drilled holes along the back of the dresser (#2). Insert 2 screws (#A) into each rail and secure using a Phillips screwdriver.