#4 Step 1
Whistling is fun but not everyone can do it properly. Honestly speaking, whistling isn't easy either. There's an entire mechanism that needs to be followed to whistle properly.
This is your step one. Look at the image properly and see how the fingers are placed. Try and do this properly first.

#3 Step 2
This is a very crucial step. Your entire whistle depends on the way your lips are placed. Once this is properly done, you can move ahead for further steps.
The most important step is yet to come.
Keep reading ahead to know about that.

#2 Step 3
Time for some pushing. This is just a rehearsal preparation for the final show. Once you are perfect with this, your whistle will be loud and clear.

#1 Final Step
And finally, Blow! Blow through the hole between your fingers. Slowly, listen to the whistle. You'll get a long clear whistle.