Step 1: Go Into Minecraft
You would obviously have to go into minecrafts home page
Step 2: Create a New World
In order to do this, you have to go to the create a new world selection.
Step 3: Go to World Settings
Go to world options, once you're there go to world type and go all the way to the end at customized.
Step 4: This Is a Bit Tricky
Once you get to the customized section, you have to press shift and click the world type at the same time.
Step 5: And Ta-da! You Are in Debug Mode Vote for Me in the Minecraft Contest
You followed the steps correctly and you are now in debug mode, but you can't touch anything, mojang says so ! Please vote me for the minecraft contest :3