Sit on the corner of the seat on the inside of the turn and lean your body right over. Quad bikes just want to roll when cornering especially with your weight being high up. So you need to get your weight low and counter-balance the side wards force.
Have a quick google, sure there's a few bits on it. I don't advise going beyond your capabilities and what you feel comfortable doing, they're lethal things. I flipped one and its not nice. Ill stick to two wheels for thrashing off road.