1. Cross the plastic ropes, and pull the rope at the top out of the small circle formed by the crossing to form a small slipknot.

2. Tie a small slipknot at the end of the balloon and adjust the tightness to ensure that the balloon will not leak or fall off.

3. Choose the place where the balloon needs to be hung in the store and fix the small slipknot at the end of the balloon on the wall or other objects.