Intense training. You can not melt away fat from one day to another... clean eating, serving size should be half of the plate veggies then small portions of whatever else. Drinking a lot of water. Cut off sugars and limit on salty stuff. No fast food, foods high in fiber and a lot of fruits.
Make a schedule for eating, it's should be ever 4 hours Si you keep the metabolism active. Breakfast, snack (fruits, granola bars, etc) lunch, snack, dinner.