Step 1. Get a USB wireless adapter (the built in airport extreme card doesn’t support packet injection and is hence useless)
Step 2. Download KisMac here
Step 3. Watch a tutorial video here
Don’t bother if you dont have a USB wireless adapter. However if you have an older mac laptop like G4 or something, it should work.
I haven’t succeeded in getting this working myself as I don’t have an adapter, but you bet as soon as I get my hands on one I will be exploiting every WEP connection nearby.
witch adapter do you say I need to get