how can i reprogram my 03 ford galaxy TDI key?

to open the car you have to open the door at the passenger side by turning the key to open and close 3 times as the drivers door won't open until you do this. We have to do the same with the spare (no buttons) If you open the door via the drivers side the alarm goes off. We have key with a red eye on the top-2 buttons.Went to have the battery changed in the key but it doesn't need changing. Tried the suggestion for the 02 model but cannot locate the red LED light by the clock-could it be the light on the drivers door or is that the sensor?