cut out soft drinks, drink water, no fast food, and like stated above, burn more calories than u take in.
This doesn't mean starve yourself. Eat good foods and workout hard but not to the point of passing out.
I lost a lot of fat by exercising everyday and basically eating turkey sandwiches as my meals, and fat free pudding as snacks. If you need that soft drink taste, then I suggest Diet coke or Diet Dr. pepper(taste exactly like regular).