Mumble Server85.236.101.45:3187
You can download Mumble from:
http://mumble.sourceforge.net/Main_PageOnce you've installed Mumble, run through the audio config wizard (it will start automatically when you open Mumble for the first time). When you have created your mumble certificate remember to back it up - if you don't it means more work for us trying to change the permissions from the old account to the new one. If you had a mumble install previously, you should have a certificate still (but you're probably not reading this because you know what to do with Mumble).
When you're in mumble you can connect to the MoX server "Server > Connect > Add New" - enter a label "MoX" the IP and port (above) and your username. You can't change your username once you become registered with the server, so make it appropriate (preferably matching your forum alias). Once you're in you'll be in the root, and you won't be able to move around until someone allows you to auth with the server (officers, captains and council will be able to do this).
You can probably work out the rest on your own (you've probably already figured out the above too, tbh). The wiki linked above is a useful source of information, should you want to know more about things.