Open this link: Basic Combat Example
The first thing you need to do is click the "Remix" button in the top left of the game. This will create a copy of the game that you own and drop you into it in edit mode.
Next stop the game and take a look at all of the elements in the world. You will see several small islands and a collection of settings and templates we’ll call the "Work Room".
The Work Room is a hidden place where you can easily access and change all of the various settings and objects in the game. You can also add your own new elements to the game here.
The other sections will go into more detail about each aspect of the game and explain how to adjust or create your own!