You should have an electrical compartment access door, either on the right (curb) rear corner of your coach, or the one stop convenience center above the rear bumper. You should have a 30 amp RV make plug, that looks kind of like a dryer plug. Don't plug it in to the dryer plug, it is 120 volts (but I know you knew that already).
If it is not in either of those places, you can hunt down the breaker box in the coach, look where the heavy duty cord comes out of it, and look at the outside of the coach in that same area.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.