When in Create mode: Use the arrow keys to switch costumes, press space to change the color, and press the "change background" button to change the background. To load a save code (and have the ability to edit it) press the "load save code" button. To get your save code, press the "get save code" button. When in View mode: You cannot do anything. This mode is to load already created things to look at, and not to edit.
If you are editing this project, FYI the 'start' broadcast is for creating, and the 'view' broadcast is for, you guessed it, viewing.