How to create a menu sign
- Place a sign.
- In the first line write [Menu] (you need the permission "chestcommands.sign")
- In the second line, write the file name of the menu (you can avoid the extension ".yml").
If the menu is successfully created, the first line of the sign will became BLUE.
If there is an error, the first line will become RED and an error message will appear on the chat.
This is how the sign should look like, with a file named "tutorial.yml":