Ok, here.
Go and download this screenshot program.
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After that, download it and set it up.
All you have to do after that is open it up,
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When it's opened just close the screen that pops up. If no screen pops up, make sure its running in your program bar,
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Then all you gotta do is press the "Print screen" button on your keyboard. it sometimes will say "Prnt scrn" or "prt sc" for smaller keys. Should be in the upper right corner of your keyboard. So with whatever your doing, it will take a snapshot of whatever is on your screen. After that, it will open up a editing software with your pic! then you can mess with your pic, or just crop it to your wanted picture like so:

SELECT THE SPACE YOU WANT CROPPED:
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And then clip the "Crop" button in the right sidebar, its hard to miss.

After you have cropped your image to what you want it to be, Click the "Upload" button in the upper left hand corner.

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When the screen pops up, click on "Imageshack" frog button on the left side.
And then click the "Upload" button once more, this time in the bottom left corner of the pop up screen. It will then be uploaded, and it will give you a screen saying it's complete, with a mini pic of what you uploaded, and below that a ton of links.
COPY the link that says "HOTLINK FOR FORUMS" and paste it where you want it, and it will give you your image!!
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Have fun guys.
+Rep is appreciated if this helped you.