How to reprogramme Focus keys ?

Having bought a Focus 1.6 2001 X reg, which is missing the remote 3 button fob key, I bought a used replacement on ebay, this needs to be reprogrammed specifically to my car, this is an expensive thing to have done but I've heard reprogramming of the remote 3 button fob key can be done at home, can anyone provide the the info on how this is done.

Thanks

SHould be turn the key from off to run position 8 times ending in run position. The locks will cycle, then you push a button on the fob. Locks will cycle, turn key off then your done

Focus right... Lap belt in...make sure doors closed Turn key 4 times to off... you should hear a beep then hit lock and unlock... programed...

7 to 8 times on are for Freestars,taurus, and F-150