This command is used to create a mute role and setup channel permissions. This is a guided procedure, so answer to what the bot says in the channel you used the command in.
This command's level is 100 by default. The bot needs Send Messages, Read Messages, Manage Roles permissions in order to be able to execute this command. It additionally requires permission to Read Messages and Manage Permissions in the channels where you want the mute to be effective in.