Here's some pics I did that might help you mount the fog light to your (plastic) bumper and light switch. First pic is looking in on the passenger side wheel well. I went in from the lower wheel well area on each side.
Your OEM fog light kit should include the screw (housing bolt), screw clip (housing clip), and spring clip. If the kit is missing any parts, look at the second pic for part numbers. My kit was missing the hardware (it's supposed to be included).
Slide the spring clip into the fog light housing as shown in pic. Slide the screw clip over the bumper mounting tab that is on the upper far side of the fog light (can't see it in this pic). Push the fog light onto the bumper so that the spring clip engages onto the bumper tab. Install the screw into the screw clip. Make sure the fog light is mounted with the connector facing down. Grab the plug for the fog lights and plug it into the fog light.
To install the fog light switch, remove the 3 Phillips screws in the bottom of the steering wheel cover. Pry the cover apart: it helps to push in at the seam of the cover or squeeze with thumb and finger at the seam of the cover where the light switch is enough to slip a pry tool in (maybe a thin plastic spatula?).
Once the cover is removed, the light switch can be removed by pressing on the upper and lower tabs at the connector end of the switch while pulling it outward towards the driver side window. The new switch will snap in place.