Help Removing Trim Pieces

How do you remove/loosen all the trim on top of the carpet from the driver to the trunk? I pulled up and then one of the pins lost it metal cover and I couldn’t get it back on. I will be trying to run an amp wire back there. Or how did you guys install an amp?

UPDATE: The trim pieces are easy to remove. Start where they overlap and stick a screw driver (or similar object) under the top trim piece and pry it up. Thats all there is to it. The to put them back on, line the clips on the bottom of the trim, up with the holes and push/smack it and they will go in.