the hrns is held onto the door cup with two screws. To remove the door cup use a pic/pry tool to gently pull the top portion towards you(horozontally), once that is done then pull the bottom portion up(vertically). Take the screws out and the hrns will pull right off. Repeat in the oposit steps to put back together.
The door locks in our cars is a funny system called a 5-wire-reverse-polarity sytem and can be a little tricky to diagnose what is really wrong. It uses a master/slave switch combination where the advantage is that it doesn't need relays(cheaper) but the disadvantage is that it can be a PIA to diagnose problems with. Don't be suprised if when you put it on that you have the same problem, if so hit me up and we will work through it.