If you have a PC, and have a normal keyboard, there is a button on the top right of the keyboard. There is a set of three keys, which should say, from right to left: "Pause/Break", "Scroll Lock", and "Print Screen/SysRq". "Print Screen/SysRq" is the button that will copy whatever appears on the screen.
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For Windows and Apple the screen capture function is different. For Windows users go to file in the web browser and go to screen capture. You could also just select print screen or save the screen as a picture format.