Wash and dry your hands
Wet your lips slightly
Make a small circle with your thumb and index finger
Place the tip of your tongue against the inside of your lower front teeth
Tuck your lips tightly over your teeth
Insert the finger circle into your mouth until it rests against your tongue
Blow air steadily over and through the opening
Adjust finger position, tongue placement, and lip tension until a whistle forms
Try different finger combinations if needed
Practice with short, controlled breaths until you get a clear sound