After pressing the New Game button a new untitled game is created and you'll be directed to to game editor screen.
Two roles (Player 1 and Player 2) will be auto-filled for you for ease, but you can rename these roles however it best suits your game. You can add as many roles to your game as you need. On the left side of each role you can set the color with which they will be represented throughout in the game. Click on the Edit Roles button to add the role to your game.
To add title, description and other details of your game, you can press the back button. Here you can enter the title and description of your game and upload a cover image for your game.
You can also upload a Youtube video introducing your game. In case you upload a Youtube video, it will replace your image in the game Marketplace.