How to learn how to whistle using my fingers
It made me
succeedy 
"Nothing can grab someone's attention from a distance or hail a cab better than a whistle with the help of your fingers. "
How I did it:
- Form an "OK" sign with your thumb and index (or middle finger). Make a small gap between the tips of your two fingers.
- Stick the two fingers slightly into your mouth, and close your lips around just enough to allow air to flow through the gap between your fingers. Your lips should be stretched tightly, not loose.
- Press your tongue to the back of your lower jaw, just behind your bottom row of teeth. You should feel a small ledge or bump in your mouth.
- Blow air using the top of your tongue to guide the air through the small gap in your fingers. Blow lightly at first, finely adjusting your finger, lip, and tongue placement until you hear a faint whistle. Then begin to blow more air to make for a louder whistle.
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