Answer:
First you look for the button on your keyboard titled PrtScr, click that then open the program Paint click edit then paste. The image will appear on the screen. Then use your paint tools to edit it how you like ( i don't know how to add pictures or clip art sorry) then when your done save it. If you want to start over but you dont want to save it click Image then Clear Image. This is for Windows BTW i don't know if you use the same process on a Mac or a Linux (if anyone actually uses one of those)
Sources: rey06190's wordpress blog