Hit the shift+prnt scrn. This is only for PC's, then paste the picture into paint or some other art program.
For macs hit apple+shift+4 for a cursor to appear, then drag that over the place you want to take the picture. The picture should appear in your desktop.
usawchamp, do you mean how to link a picture here? Because if not, it shouldn't be in the S&S section. To link, copy and paste the url of the picture. Then highlight it and press image. Voila! Bad thing is you cannot link directly from your computer.
As Nichodemus said you can't post directly from your computer. You need to upload picture to photobucket or any similar site. For those above you don't need to hold Ctrl or Shift button when pressing PrtSc. PrtSc alone is enough, then paste in Paint and save image.
Looks like everyone's post just says 'Print screen', 'same for me'. In essence, these are all spam. If you don't have any more input, please do not keep repeating the same thing over and over again. Cheerio.