Press "P" to open up the app viewer. Press "Space" to start up the OS in the black and green screen only. (Unless if you are in the startup menu, you will exit and startup.) Press "Y" to enter the bios/startup menu. (If on the black and green screen.) The default password is "LachlanRules". (You can't change it, yet.)
I created this in less than 24 hours. All credits to me except for the desktop background and the startup sound and background, that goes to the Scratch team! :) I wish I could convert .sb2 to .iso so I can use this to boot up my PC! If anyone is smart enough to create that sort of thing, I would really appreciate if you would comment the link (or download link) for me!