The lower door seal (the one on the bottom of the door ) is held in by the screws along the bottom of the inside of the door. Remove these 5 screws and slide out the seal, replace the new one in the same way that the old one was removed then gently tighten the screws back it doesn't take much to strip the thread.
The main or upper door seal is a press in item remove the old one by gently pulling out and from one end push it back into the channel making sure that seated properly all the way around
John, May 2009