If you are making a world then:
At the Main Menu press: Singleplayer -> Create New World -> Gamemode: Creative.
If you already have a world then:
(If cheats are enabled) /gamemode c or Press 'esc' -> Open to LAN -> Allow Cheats: ON -> Start LAN World -> Go back into game and type /gamemode c
Note:Opening your game to LAN will not allow random players to join your world, if someone else in your house is using the internet and are searching for LAN worlds on their PC then they might be able to join (but to be honest I have played loads of LAN survival with my friends and you can't actually see the world unless you have an amazing internet connection, we usually have to type in the port).
Happy Minecrafting!
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Download the mode or change the play mode to creative.
there is not a creative mode on xbox minecraft but im shure if you ask notch he might add it
Yes. In order to play in Creative mode without downloading Minecraft, go to their website, and find the button that says creative mode (free). And also browser on SupremeStrategy .com
Yes, it is under "Materials" in the Creative Mode inventory.
If you are playing on a PC single player mode, type /gamemode s This will toggle the gamemode back to survival mode.