ok. to code the key in diagnostically it will either be 10mins timed access or give you an outcode. Then you will need to enter the corresponding incode. Not sure which it will be with a Cougar as i've never done a key for 1.

All the other older Fords i've done have been 10 mins timed access. So basically you just sit there for 10mins with the ignition turned on. My key programmer counts the time down on the display then tells you to cycle the new key in the ignition.

If it gives the outcode & he hasn't got any way of getting the correct incode or doesn't have any equipment that can bypass it then you're going to be stuck