The connector is two pieces, the first is the pressure lever that you pull down and pull out in between the door and the body of the car. The second look at the other part of the harness between the door and the car frame and push up on the bottom of that piece of the harness. This will free it and allow you to push it into an area where you can pull it down and cut the plastic spacing out and run your wire.
Before cutting
After cutting
The lever part
