2002 Taurus programming key fob

I want to prchase a key fob from e-bay but I don't know how to program it! If anyone can give me directions it would be greatly appreciated.

I want to prchase a key fob from e-bay but I don't know how to program it! If anyone can give me directions it would be greatly appreciated.

Turn ignition key from off to on 10 to 12 times quickly (Try 10, then 11 then 12, till it works). Door locks shoudl automatically open and close, which indicates you are in programminmg mode. Click arm on the key fob and it shoudl be programmed. Repeat for other key fobs. I read this in internet and just had Ford dealer try the same method while helping me with Windstar Key fob program issue.

Cycle the key in the ignition from lock to run 8 times within 10 seconds ending in the run position. The locks should lock and unlock.
Now press any button on one transmitter and it should lock and unlock again. Do the same for the second transmitter and it should lock and unlock, then switch the ignition off and it should lock and unlock once more. Verify that the keyless entry transmitters work properly.

You must have at least two transmitters to program. (even if one works)
Up to 8 keyless transmitters can be programmed to one vehicle.