Use a plastic removal tool to lift it up. It should just pop out. parts like this should an interior/exterior trim part. i would start there and take a look at the diagrams since you do not know the part number. May take a bit of hunt and miss.
I was able to pry the clips off, took tons of force from my trim removal tool, almost broke the tool. Reason is because there are white plastic retainers below these clips that are a perfect fit and "clamp" onto the little round end of the clip.