Ahh...you mean "Bezel".Good you asked because I broke mine..and I was tryin to be careful.
First you have to pull the radio.If you havn't allready,go to your local parts store and get the 2 -U- shaped tools for removing the radio.They fit in the 2 sets of holes on the radio front.Push in until it clicks then pull radio out.
Now,behind the radio there's a longer piece of plastic that goes to the far back.Theres a hex screw in there that holds the bezel in (thats where I goofed).Get the screw off and then carefully pry at the top portion of the bezel.Just above the vents.It locks into place up there.