Samsung ML-2251NP - Manual (Page 186)

I NSTALLING P RINTER O PTIONS E.9
E
8 Close the control board cover.
9 Tighten the two screws.
10 Insert the antenna counterclockwise, as shown.
N OTE : For information about configuring and using the printer in
a network environment, refer to the User’s Guide provided with
the network interface card.