Mike - It is connected with plastic push-in trim pins that will likely need to be replaced when you re-install. I found suitable ones at AutoZone. The more of the upper dash you remove, the easier it will be to get that grey plastic cover out. I found that I had bend it considerably to get it to clear the vent handles - I thought it was going to break, but it was surprisingly resilient. Getting it back in was no easier - you just have to patiently work it into place.
97 D90 SW