How to connect a rear fog light

[cashville]

I want to place a rear fog light on my h2, like this one:



I already have the fog light, and the switch to turn it off and on, to place near the lights switch.

I was going to go to a shop to have them place it for me, but if it's something simple, maybe I could do this work myself.
Anyone can tell me how I would go about doing that, so I can see if I can do it myself?