Wet your lips slightly
Purse your lips into a small round opening
Relax your tongue and place its tip just behind your lower front teeth
Blow a steady stream of air through the center of your lips
Adjust the opening size until you hear a whistle
Move your tongue slightly forward or back to change pitch
Tighten your lips a little more for a louder sound
Use stronger, steady breath support
Practice with small adjustments to find the loudest position
Keep your jaw relaxed while maintaining a firm lip shape