How do you put a crystal for auction on avatar fight?

It seems you're asking about how to sell a "crystal" in a game called "Avatar Fight". However, I don't have access to real-time information or specific game mechanics for individual games.

To learn how to auction crystals in Avatar Fight, you'll need to:

1. Check the game's official resources: Look for information on the game's website, forum, or wiki.

2. Consult in-game help: Most games have a help section or tutorial that explains various features, including trading or auctioning items.

3. Join the game community: Look for active online communities or forums dedicated to Avatar Fight. Other players might be able to provide guidance.

Remember:

* Be cautious when dealing with in-game items or currencies.

* Never share your personal or account information with strangers.

* Always follow the game's rules and guidelines.

Good luck with your auction!