To get started, you can check out this guide over here. This will show you our mumble information and how to get mumble. Mumble is a voice chat application for groups which is similar to programs like Ventrilo or TeamSpeak.
Whenever you create a thread and someone posts in it or if you have posted in someone else's thread, it will automatically be marked as "Watched." To stop receiving alerts, go to the top right hand corner of the forum and select "unwatch thread."