I don't use Windows or macOS so I can't speak to how they work. On Linux, simply launch the app and run through the audio setup wizard. After that, go to `Server -> Connect -> Add new`. Enter whatever username you want, use `nixnet.xyz` as the address, `64738` for the port, and label the server however you'd like. When prompted, the password is `NixNet`. Pretty much the same goes for the Android app; open it, add a new server, enter the information above, connect, and start chatting!
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If you want a new channel made for something (game, podcast, private call, etc.), just [let me know](/contact) and I'll create one!
Download it from [F-Droid](https://f-droid.org/repository/browse/?fdid=com.morlunk.mumbleclient). It is also on [Google Play](https://play.google.com/store/apps/details?id=com.morlunk.mumbleclient.free) but I recommend using F-Droid instead.