If memory serves, there is a philips #2 head screw under the speaker cover that holds the front of the dash panel in and there are two bolts on the rear corners of the dash. I would try tightening them all, if that did not work would loosen them and shove the dash forward hard, it may have slid back a little.
You will need to take the underdash panels off to get to those two rear bolts. They will be up under there, near the outside edges. There are some slotted chanels they slide in, allows some adjustment with the dash. You may need to loosen both or just one of them to adjust the dash. Just use whatever you can and shove the dash ahead to get it up against the cowl tight. KLast time I had to replace one I used both feet to push it in place. That should stop the sqeeking, if that is where is was loose. Lots of stuff under there that can do that too.