When you select Play your code from Edit will be turned into a game that you can play. You can go back to Edit as many times as you want to keep adding things to your game like new modules.
Read the main game documentation here.
View all of the different modules that you can require at the add-ons section of voxeljs.com.
You can go load any github gist that has a voxel game inside a file called index.js. To save and share your code as gists you will need a Github account. It is free to sign up for one and they are useful to have as a coder. After you save you can share a link to your game with anyone!
Here are some examples to try out:
Made by @maxogden. View the source or report bugs on Github.
Play icon designed by Henrik Lund Mikkelsen from The Noun Project