If you just have the old standby wall switches, it should be the third switch of the four switches on the wall by the stairs to the bedroom. At least that's where ours is.
First switch is the four overhead kitchen lites, the second is the two overhead lites in the livingroom, third the the lite over the island, and the fourth is the overhead lites in the bedroom.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top