Okay, so I found the Power Control Center. As you might have expected, it was right in front of me. A brown panel below the closet had a latch that didn't seem to do anything. I pushed it up, down, left, right, and in - I never thought to rotate it.
Concerning the WIT number, we joined in 1972. The lady effectively told me that were I to put the coach in my mother's name, she could re-join and we could have 5051 back. I'm actually thinking about doing that - it would only me cost me $18 to change the registration.