Just do what the pencil tells you to do. I like 529 and 311. HOW TO TAKE A SCREENSHOT: Press the "PrintScreen" or the "PrtSc" key on the keyboard. Next open an image editor like paint, and click "paste". Then just save the image. Voilà! You have a screenshot!
Thanks to lavaghost123 for part of the script and ideas: http://scratch.mit.edu/projects/10040892/