How to replace 3rd Brake Light?

[jksymz75]

I noticed after rain when I open the rear hatch would get water dripping through the trim around rear glass. Thought maybe it was a compromised gasket but I think the culprit is a loose fitting 3rd brake light.

I’ve got the trim off and the defroster module out of the way but not sure how to remove the light itself. There’s something that looks like a slotted screw in the face of the light but it’s plastic and when I tried to back it out it stripped.

Any hints before my gorilla hands break something?