The Mumble clan channels are available only to users which are in a special group. A clan channel admin can add and remove users from this group.
- Right click on the channel you want to modify the user list and choose "Edit ACL"
- Switch to the "Groups" view
- Now you can modify the group list:
- Add a user by entering the username in the inputbox and press "Add"
- Remove a user by selecting the name in the list and press "Remove"