This step will help you connect to wireless internet and get you back to surfing the internet faster than before. You can add a AirPort to your computer even if it did not originally come with one.
Using a Phillips #00 screw driver, remove the four 6.86 mm screws from the metal plate.
Remove the metal plate from bottom of the iMac G4.
Use a spudger to lift and remove the AirPort's antenna connector.