306 phase 3 central locking help

[Speed-Demon]

hi

i have recently just bought a 306 phase 3, 2001....i come to use the central locking and it dosent work, on my old 306 infa red central locking, i could re-program it by putting it in the ignition and pressing the button so on,...but on the key i have it wont let me do it, i was just wondering how do you program it so it will work, thanks