Probably has clips everything GM is clips, clips, clips and in the stupidest to access spots. Best way to see is take the hood latch cover off should be pretty self explanatory after that but likely some arm contortion.
The accessories site used to have a replacement insert that was all black, that i thought had instructions. but i just went and looked and this replacement grill bar is no longer there. But if i remember correctly, it was just clips that held it in place.
Weird that it has disappeared from their site for ordering. Here is a pic from Ebay. It shows all the fastening points. It looks like it snaps into place. Shouldn't be too difficult.
Black version is P/N 42712434