If you help me, i will give you some PROPS.

-Press the "Print Screen" key, on the top right corner of your keyboard. Open the paint program, or bitmap image or whatever, then copy and paste it with Ctrl + v.

-Use a camera.

The way I do it is by pressing ctrl(just below shift key) and print screen at the same time. Then I open it up in an image manipulation program, press "paste", and save as either a .jpg .png or .gif file. I would suggest .jpg or .png over .gif though.