Enable the console, then go to it and type "sv_cheats 1" without the quotes. From here, use codes like "god", "impulse 101", "noclip", and "physcannon_mega_enabled 1" to have some real fun with the game.
Note: sv_cheats will turn off achievements for the game, so it's good to find some commands that don't take sv_cheats. Once you've enabled them, the achievements are off for the rest of the game, even if you turn off sv_cheats (sv_cheats 0)
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When creating a world, you have the option to enable cheats. (e.g /gamemode 1) This option is disabled by default. To enable it, simply press the button.
UPDATE: I open CWCHEAT in game, activate the cheats, hit enable cheats too, and when I choose my cheats, nothing happens in game.
Go into the console and type: sv_cheats 1
When you make the world enable cheats but under the lan world options make it so joining players have cheats disabled.
emerald is only for gba so you can tenable them for other systems