Eat less and move more, unless you have a medical condition that affects your mobility or a hormone/glandular problem then you’re capable of losing fat without much difficulty and the only way to lose fat is to lose weight overall as you cannot selectively lose fat in specific areas, and you do this by using more calories than you consume, some people swear by diets, fasting and ‘cleansing’ but I find these unnecessary and borderline dangerous, the best thing you can do is cut down your food intake slightly and make a point to be more active