Instructions
Open a new window in your Web browser. Navigate to the Mau5ville Facebook page.
Click the "Discussions" link. Click on the "White List" post at the top of the list of discussions.
Click the "Last" link. Scroll down to the bottom of the discussion thread. Type your "Minecraft" username into the "Reply" box. Do not type anything else into the box. Click "Post Reply."
Launch "Minecraft." Type in your username and password and click "Login."
Click the "Multiplayer" button on the main "Minecraft" screen. Type "mau5ville.com:25565" -- without quotes -- into the text box underneath the "Enter the IP of a server to connect to it" heading. Click "Connect" to join Deadmau5's "Minecraft" world.