There's no such thing as spot reduction, the only way to reduce your belly fat is to reduce your over all fat, you have to do cardio, gettin.g your heart rate up is the only way, and eat healthy maybe lift weights depending on your goal. Good luck.
Go for walking, drink more water, eat more fruits and vegetables than fatty foods, sleep well in the night or in the day time, drink a cup of warm water soon after you wake in the morning and before you go to bed in the night..