From Multiplay Wiki
The first time you run your Mumble server, nothing will be set up on it and it's likely you'll want to sign in as the administrative account to make some changes.
Mumble features a unique system for initial administration by having a SuperUser system. The SuperUser is an account that can be used to make any changes to the server and features all permissions automatically checked, but can't be used like a normal account for talking and otherwise.
To sign in as the SuperUser to your Mumble server, you first need to configure your ClanForge Mumble Profile.
|Setting||Profile Name||Server Name||Admin Name||Admin Email||Max Players||Admin Password||Game Password|
|Description||Name of your ClanForge Profile for reference only.||Name of your Mumble server as it will appear in your Server Status XML.||Name of your Admin, generally for reference only.||Email of your Admin, generally for reference only.||Maximum players able to be online at once, limited by how many slots you have purchased.||Password for the SuperUser account, what you will need to sign on and configure your server.||Password for the server, if you want to require users to input it before connecting. This is ideal for servers intended to be more private.|
Signing in as SuperUser
After you have configured your server, you'll need to add it to your Mumble client. The first time you should enter your name as SuperUser and enter the password from the Admin Password field as your password when prompted. Once signed on, you can begin making changes.
If you right click the name of the server and then click Edit in the dropdown menu that appears, you can edit the basic properties, functions, and groups of the server. Click on the Groups tab, enter your name into the box, and click Add. As you can see, Wahrheit is already set to be an admin of the server used in the example.
Signing in Normally
Once you have specified your nickname to be an admin, just disconnect, right click the server in your favorites and edit your connection settings to be set as your nickname, rather than SuperUser. Congratulations, you are now a Mumble admin and can being making channels and generating chaos!