Abaddon's official documentation.
Symbols such as: <> or <?> must not be mentioned when using the command.
First to avoid any permissions issues, grant
Administratorpermission to the bot and make sure the role of the bot is high enough in the role hierarchy.
Mention Abaddon and she will remind you :p
If you do not understand how a command works despite the documentation or if you encounter problems or want to make a suggestion do not hesitate to join the discord support server.
Here you can see the different categories of commands as well as the usage for each command.