Wash and dry your hands
Cup both hands together with your palms facing each other
Leave a small opening between your thumbs
Fold your fingers inward to form a tight chamber
Place your thumbs against your lower lip
Put the tips of your index fingers together to make a narrow gap
Tuck your tongue back slightly
Blow air steadily into the gap between your thumbs and fingers
Adjust the angle of your hands until a whistle sound appears
Change the size of the opening to make the whistle louder or softer
Move your tongue and lips slightly to fine-tune the pitch
Practice with small adjustments until you get a clear whistle