Do you have the code? If so the procedure is simple.
1- hold central locking button down red immo light flashes slowly count number of 1st digit of immo code and release.
2- hold down central locking button and count 2nd digit and release
3- repeat for 3rd and 4th digits
4- Immo light will illuminate constant, start the car.
eg 2543 press and hold for 2 flashes and release, press and hold for 5 flashes and release, etc...
If you don't have the code, contact me.