Ok here you go:-
To programme the door (and boot) opening of the remote:
Start with the driver's door open.
Insert a working Master Key (3 button) in to ignition, turn to on, then off and remove.
Lock, then unlock all the doors using the POWER LOCK button on the drivers door FIVE TIMES (lock unlock lock unlock lock unlock lock unlock lock unlock)
Close drivers door, then re-open.
Lock, then unlock anotheR FIVE TIMES, exactly as before.
Insert your new key into the ignition and turn to on, then off agAin and remove.
The door locks will then start operating.
While they are clicking away,hold down the lock button on the new key and press the unlock button on the key 5 times. Then release and press unlock button once.
The doors will lock and unlock once...and ure done!
No it won't mess anything up. I failed a few times at doing this. It can get frustrating!