Like BigJet said, but I’d recommend Image Shack as its easier to use.
Anyway like he said, press print screen on your keyboard. After closing down the SIM go to MS (Microsoft) Paint and go to edit and select paste, you should see the shot now.
Finally go to image shack and upload it (you’ll see its simple to use)
Then once on this sight simply press the Insert Image button and insert the DIRECT LINK from the list of links you get from image shack when its uploaded.
And thats it