dashboard dis assemble?

How does one take off that upsidedown u shaped piece of dash board trim thats right in the center of my dash. It goes around the middle speaker and travels all the way down the sides of the center counsol. I have a terrible rattle when travling over bumps. If I could just know how to pop it off I could mount some felt tape on the back to get rid of the noise. Any help would be appreciated. Thanks