Hiya,
My memory is so terrible but i think you do it like so:
*Switch engine on
*Press your memory button so the seat goes to how you have it
*Switch engine off, stay sat in drivers seat (All doors must be shut)
*Press and hold the set button on memory seat panel, whilst holding the set button press and hold either lock or unlock on your key fob.
*when you hear the beep it should be set. (you might not hear the beep, if so just hold them both for 10 seconds.)
Now to test it, press your wifes memory button, get out of car, lock it, walk away and when you walk back up to the car and touch the handle to unlock it, the seat should automatically be moving back to your position??
Then do it all again with your wifes key, and then you both have seperate programmed keys :)
Hope this helps.