Transfer switch for Generator

[zell90r94]

Hello,
Newbie here.... 1st 5th wheel. 2011 347tht. Trying to figure out where the transfer switch is and is it a manual switch that has to be flipped when going between shore power and gen power? what is the procedure for starting and using the generator. The gen is an Onan 5500 LP. the previous owner never used the generator and there was no paperwork in the camper.

Thanks in Advance!