Install an Airport Extreme 802.11g card internally.
Use a coin to rotate the battery locking screw 90 degrees clockwise.
Lift the battery out of the computer.
Pull the keyboard release tabs toward you and lift up on the keyboard until it pops free.
Flip the keyboard over, away from the screen, and rest it face-down on the trackpad area.
Push the wire clasp away from the AirPort card and toward the display, then rotate up to free it from the RAM shield.
Grasp the clear plastic tab on the AirPort card and pull toward the display.
Hold the Airport card in one hand and use your other hand to remove the antenna cable.