Click the button that says: World Type: Default, and it will turn into World Type: Superflat. Then create the world.
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You can't
Getting onto Minecraft Multiplayer is very simple. All you need to do is when you get onto Minecraft you click "Multiplayer" instead of "Singleplayer", "Mods and Texturepacks" or"Options" and type in the Multiplayer IP (which you can get from the Internet or a freind) and click "Connect".
You cannot get Minecraft multiplayer for free. You must buy the game to be able to log onto a server.
What do you mean by this? If you simply mean have minecraft on more then one computer then of course you can. As long as you have a valid account you can download minecraft onto any computer.
You don't donate on minecraft, you buy the game, which then regesters your minecraft username to be a account that has bought the game. If you mean how do you donate to a specific minecraft server, then go onto the server website, and they will probbaly have a DONATE button.