Unless it is very different from my daughter's '93 LX, the cable from the panel goes to a mixer box at the bottom of the center console (like, under the radio). There should be a small panel at the very bottom of the console near the passenger's feet... IIRC it is held by one or two screws and the vent pulls away from the duct that feeds it. Once the panel is off you will see how it works, and it is straightforward.
Mike