yeah but how do i take the screenshot and how do i link to it and sorry for being so dumb at this kind of stuff
hold the printscreen button on your computer. then go to MS Paint or any other graphics program and paste the image to a canvas. save it. go to an online host, such as your profile page or photobucket and upload the image. then use the system you did for your sig: take the URL of the image and put it in the [ img ] [ / img ] brackets (no spaces, remember?).
that's the button. when you hit it, whatever is on your screen is automatically copied. go to MS Paint, then to the tool bar. under Edit, you'll see Paste. hit that to get a copy of your screen from a moment before. crop out what you don't need, possibly shrink the image a bit, and save the file.