How do you tie an air balloon?

To tie an air balloon, you simply create a knot in the balloon's neck. Here's how based on the provided YouTube reference:

1. Take the neck of the inflated balloon.
2. Wrap the neck around your fingers to create a loop.
3. Put the end of the balloon's neck underneath the loop you've created.
4. Pull the end tight to form a knot.

Following these steps will result in a secure knot, sealing the air inside the balloon and preparing it for your party!