In game setup you can add in instructions for how to play your game, information about the author (you!), how many players, the game icon etc.

In the Storyboard editor, click on Edit > Game Setup

The Game Setup window appears

 
   
You can give your game a title.  This will appear in the bar at the top of the window when the game runs.

Type in the author's name.

It is best to leave the window settings as they are, unless you know what you are doing!

You can click Change Icon and draw a new icon for your game.  The icon will appear on the start menu when your game runs.

Create Game Instructions will open a window to type in written instructions on how to play your game. It is very important to give your players information about what the goals of the game are and how to play it.

Clicking Players will open the Player Control window
You can create up to 4 player games.  Clicking on the cross in the keyboard row will open up a window where you can set which keys move in which direction.

Clicking the Score and Lives button will enable you to set the number of lives the player will have.  It is set to 3 by default.