KittyCraft, to get your private server (if you still don't have one) click the green box that says "Click here to set up your server!" Then select a world and click start server. It will take 7 minutes to boot at most, so you can click the pink square that says "Server can take 7 minutes to boot. Want to have some fun while you wait?" to play Paper Minecraft. Or whatever game is available at the time.