There are two (30 mm) screws attached to the wireless card underneath the antenna. Remove both of these with your screwdriver (bit PH1).

Once the screws are removed, the wireless card will tilt upwards. Firmly grab the card with one hand and pull it slowly, diagonally, out of the socket.

To replace this card with a new wireless card, put the contacts back into the socket. The wireless card should be sitting at a 45 degree angle.