How do you airbend like the avatar?

Any kind of 'bending' as seen in the movie Avatar is not real. It is created by the special effects department. It cannot be achieved in any way in the real world.

Sites claiming to be able to teach any such thing are a fraud.

On the lighter side:

1. Take a plastic straw.
2. Fill it with air (if you are in vacuum).
3. Seal it from both sides.
4. Now bend it.

Congrats! You can now airbend.