Once installed, open it. You should see a screen like this:
Select preferences and then select the certificate option under the network section.
Select the plus button and then select Generate New Certificate
Enter a name for the certificate, but nothing personal as this certificate can be visible by other users. You do not need to enter in an email address and I recommend not to anyways.
Now go back to the main screen. Select favorite servers and click the plus button.
Enter in the following information: Description: d-rine.com Address: d-rine.com Username: your username of choice
Note #1: Your username cannot contain spaces.
Note #2: If you use a username that is already taken you won't be able to join.
Note #3: If you have registered before it is just best you slightly change your name (ex. edshot -> edshotV2) just so you can join on the go without hassle.
You should have something that looks like this:
Then click Done. Once added you should be able to connect. The image below shows this:
Then lastly, click d-rine.com and click Connect. Now you should be connected to the d-rine Mumble server.
Note: There may be a warning box that says the app was unable to validate the server certificate.
See this page for details on verifying the certificate (not doing so will compromise your security).
Root - Automatically created by the server. Everyone denied from joining.
Lobby - Room people get put in when they first join. Muted by default.
Floor #1 - Server Created Rooms
Floor #2 - User Created Rooms
If a room/channel requires a password to join, click the three horizontal lines in the top right corner and then Access Tokens. Here you can click the plus button and enter the password.