Pop-out the pre-installed connector plate on the rear of the case and replace it with the one that came with your new motherboard.
Onto the motherboard. You need to determine where you're going to mount the board. As you can see, there are many locations to attach screws on this motherboard tray. The mounting locations coincide with screw holes on the motherboard.
First mount the standoff screws on the tray. These screws separate the motherboard from the metal casing. Sometimes these require special tools, so check ahead of time to make sure you have the right stuff.
Fasten the motherboard by starting in the center and then corners.
