Not sure exactly why it's not letting you move the selector. Are you auto or 5 speed? It may not move if you are in Park (not sure, haven't tried). If that isn't the case, look under the frame and see if the lever or mechanism is catching on something or if the linkage is catching somewhere. If you don't see anything, you may have to take off the floor cover and take a peek from the top. It could be something as simple as a small stone lodged in there somewhere.
If all looks good and still wont move, disconnect the linkage and see if it moves then. If it doesn't move, you need to take a closer look and see where it's catching at or if it's completely rusted stiff. If it moves, it's not the shifter (obviously, huh?).
Anyways, follow the linkage with your fingers and a flashlight and see where that bugger is catching. Hopefully you find where it might be binding or bent and you'll be able to fix it. If not, it has to be in the t-case. That's where I have to let you make your own decisions as I have never snooped at the internals of a t-case.
2013 Wrangler Rubicon 2dr