You have to pull off the trim panel. It should be held on with clips from the backside. Just slip a flat head screwdriver or putty knife in behind it and pry out gently. The whole piece (outlined in red in the first pic) should come off. Then there should be some screws holding the radio in, as shown in the other pics (although that's not your car, but the idea is the same). If you provide the year, make, and model of your car (or truck i guess, because of the 4WD selector) I can show you where to get detailed instructions on removing/installing the radio. But it's really very simple.

Pics from my car... different, but pretty much the same idea/setup. Pull off the trim panel, then remove the screws holding the unit in.




