With the lightbox bracket removed, unpack the long screen box and use the contents to complete these steps. With the small screws from the HDMI packet attach the mounting plate to the screen. Be sure to orientate the long screen with the hole for the power supply on the left. with the screws trough the back of the mounting plate fix it to the screen using the slide tabs on top to lock the mounting plate. attach the bracket, checking to see that it is orientated in the center.