Lift up and remove the covering keeping the electronics covered using the small fabric pull tab located near the center of the side closest to the car power outlet above it.

(Your car will more than likely have a small plastic covering surrounding the outlet that will keep you from removing the upholstery later. My car was missing several pieces when I bought it second hand so it is not pictured here. It can be removed relatively easy using the same screwdriver and prying technique used in the previous step.)