My grill is starting to pop out. I noticed it was in a bit and when I checked it it was loose. As it is popping out what grill inserts are there that require removing the existing grill.

 

Five screws across the top, and 4 or 5 clips at the bottom. Is it the bottom that's popping out? If so, give it a good shove until you hear it click ... unless a prior owner or mechanic has broken the clips. If it's the top popping out, insert some new screws. The bottom clips are released with a long flatblade screwdrive just above the bumper.

 

Good description by Landyot....
only thing I would add is that the bottom clips are C like clips that are best put back on by putting them on the GRILL then push the grill into the retaining slots on the truck...

best to take the whole thing off if they are loose, then reinstall as above to get it clipped right... otherwise you might force them on incorrectly....

(DON'T ask me how I know )