Push lock fastners?
You'll see there is a smaller round center plastic pin. Pry up under that and pull it up as far as it will go (not all the way out). Then slide something under the large plastic piece under the center pin and pop the entire fastener out of the hole.
Once you get it out you'll see how they work. Outside plastic body has a split pin that fits into the mounting hole - the center pin then pushes into the body and spreads the split pin apart - locking it into the hole.
I use a Door Panel Tool to pry up on both as I have one and it is easiest...
-Jay-






