bmw key entry

can anyone tell me how to reprograme a key i got for my e39 5 seires:)

open the drivers door, get in and close it. Place key in ignition, turn to the run position, and then off. Remove key. Press and hold the unlock button. While holding, press the lock button 3 times quickly. (The lock and unlock buttons on the key, not in center console) The doors should lock and unlock, and the alarm will chirp. This must be done all within 10 seconds. Once the doors lock and unlock you're done. Remember, this will render any other key inop in regards to keyless entry