Cujomike

Just purchased a Coleman UTV 400. Drove off trailer and parked with no issues. Put some gas in the tank, and went to use it, and it beeps when shifting into F or R. The parking brake light may be on, and not sure fuel gauge is working. I’ve ensure the brake is releasing, and I put 5 gallons in, so I’m baffled. Are one of these the issues or does something else cause the beeping?