When making a world
Click on the button that says "Survival" until it says "Creative".
While playing
There is no way to change gamemodes while playing minecraft unless you are using a mod. TooManyItems mod and Single Player Commands mod are great mods that let you change the gamemode while playing the world. Plus, both don't require modloader or anything like that!
To switch from survival from creative you first need to enable cheats, if you do not have this enabled then a simple way to enable it is to open your world in lan and click the enable cheats. After you've done that the command it /gamemode [your username] 1
You can't, unless you put it on cheats when you made the world. If it is on cheats, do /gamemode 1
sadly you cant thats only on the computer
By downloading an app.
you can't
To change games modes in Minecraft Pocket Edition, go to edit world and tap survival or creative
Currently, there is no way to change your game mode in a game (In the Pocket Edition). The default world will put you in survival, but you can make it a creative world by taping the Gamemode button.
There is no app you download to change your current gamemode in a world in Minecraft: Pocket Edition. Once you select a gamemode for a world, that is your permanent mode, you can't change it around.
you can't
You need the single player commands mod. Then you type /gamemode 1. This will change your survival world to creative. To put it back use /gamemode 0.
Build the map on Creative Mode then go to seedscope.net and upload your level.dat for the map on the Change Survival to Creative option. You should then download the new level.dat. Replace it with the old level.dat and when you start Minecraft, you should see that it is now a survival map.
They are the admins of the server. They can kick, ban, mute, change the time of day, switch from creative to survival or survival to creative, and have more control over the server than regular users.
Start a new world then go to the button directly under where you name the worl and click on it until it says creative.
The only way is to change the game mode to Survival by doing /gamemode 0 or for Adventure, /gamemode 2
If you are in the gamemode creative, then no mobs will attack you. To change this (assuming you have cheats enabled), you must change your gamemode to survival or adventure. To do so, type in "/gamemode survival" without quotations and including the /.
(this only works if you have singleplayer commands or if your a mod or up in a multiplayer server) /gamemode (name here) (1 for creative 0 for survival) ex: /gamemode blabla34 1 creative or to switch from survival to creative and back just do: /gm
If you are the server owner (or can get the owners to change game mode or just yours) you can switch it to creative mode in the server conf file or by command in game by and op. otherwise a server in survival mode is staying in survival mode.