QUICKLY!

Easy!

당신 hit the "Print Screen" button on the 상단, 맨 위로 right side of your keyboard.
It's to the left of "Scroll Lock" and "Pause Break"

That is basically like right-click=copying your whole screen, so 당신 have to paste your screencap somewhere and save it.

MS Paint works really good for that. Then 당신 can do what 당신 like with it, like save it, 편집 it, etc. 또는 save it and 업로드 it to some other program.

Hope this helps!

Either use prntscrn button on your computer, the snipping tool if 당신 have Windows 또는 use VLC player to screencap a video (there's a really good tutorial on this somewhere in livejournal).