How do i make use of the admin functions within the app?

To make use of the admin functions you have to make sure that you are in the serveradmin group. (any group will suffice as long as you have the right permissions to edit server- and usersettings).

To edit a user, simply click their username to open a dialog where you can mute, move, kick, poke, and perform other actions for that user.

To edit a channel simply click on the little blue arrow behind the channel -> A dialog will come up that allows you to create sub-channels, edit the codec, modify the password/description and much more. Give it a try!