Samsung ML 2250 - Manual (Page 179)

I NSTALLING P RINTER O PTIONS D.8
3 Open the control board cover.
4 Remove the two screws and the bracket from the control
board. You can discard the old bracket.
5 Insert the front of the network interface card to the
corresponding slot of the machine.
N OTE : If you are installing the wireless network interface card,
unfasten the antenna.