Remove the two silver Phillips screws that attach the heat shield to the internal metal framework.

Lift the heat shield up and pull it toward you.

Your laptop should look approximately like this.

Skip this step if your computer does not have an Airport card installed.

Firmly grasp the plastic tab attached to the Airport card and pull up and then to the right.

The Airport card is still attached to the antenna cable, so don't just yank it out of the slot.