Remove the metal plate to reveal the mainboard underneath.
With your screwdriver, unscrew the screws label below with the red dots. Remove the main board from the plastic case.
Once removed, place the metal piece you just removed back onto the mainboard by itself.
To secure the metal plate to the mainboard, find some nuts and bolts about 4-5mm long and secure it. Find two nuts for each bolt, you will see why in the next section.