If a 03 or 04, removing horseshoe should be sufficient for you to see the how it's fitted underneath. The horse shoe snaps of with prying it out semi-gently. Start from the bottom on either side.
Here's a pic from when i installed a gps antenna running through that area:
Here are some pictures I took when I did mine a few years ago. Underneath the exterior horseshoe trim there was an inner horseshoe frame that also had to come out. To get that second frame out, the radio, HVAC panel and vents all had to come out. In one of the pictures you can see the separate slot that the cupholder sits in.
Since I replaced the broken cupholder, I've never used it again - I bought the one that Suncoast sells that goes in the center arm rest compartment!