Can't figure out how to pop the PDC out
 

I have searched for this simple thing for too long and can't figure out how to take it out of the mount it sits in. I have seen how easy it is to take out the Power Distribution center on a 97+ xj but I can't find out how to on my '91. I know I could take all the mounting screws off but that won't do me any good because there is no movement in the wire harness. I am trying to simply take the 2 pieces apart and wire up a new relay and fuse.
How do I take the PDC off from the mounting bracket?? I don't want to force anything right now because I can't tell which way to bend stuff to get it apart.