2002 Honda Odyssey Heater/AC Unit controller

My AC unit is only blowing air at the full speed. Evidently, the dial that controls the flow is broken. I bought a used Heater/AC control unit online. It looks fine. It hase 3 dials and has a cut out space for the radio. I don't know how to install the unit. I don't know how to pull out the current unit from the dashboard. I don't see any screws. It looks like it pops in and out. I'm nervous that it pull on the unit, I might damage something. It looks like it simply plugs right in, but I know something is rarely that easy. Any suggestions, on pulling out the old unit from the dashboard and replacing the new one would be greatly appreciated.

Thanks James