When you are connected to the server, right click on your username, and click “Register” – if you do not see this option, ensure that you have an @all ACL that has “Register Self” set to Allow, Applies to sub-channels unchecked.
Reconnect as the SuperUser – Go back to your server list, and on the main Mumble window click Server → Connect. You will see the server you added in the previous step. Right click it and select “Edit…” Change Username to SuperUser, click OK, then click Connect.
Right click the “Root” Channel (Will be whatever you set it to as in your config file) and click Edit.
Go to the Groups tab
In the drop-down box at the top select the “admin” group
In the “Members” drop-down box at the bottom left, type your username and press enter
Click OK
Follow step 3 to change your username back to the user you added with SuperUser
Connect back to the server
Test your administration ability by right clicking the root channel, clicking Add, and adding a new channel.
Adding Channels
Join your server following the steps outlined above
When you are joined to the server, right-click your “Root” channel and click Add, then add the channel with the name and description (even picture) if you want.
If you want to add sub channels, follow step 2 on the channel you just created.