Just paste the URL of your image, press enter and it should bring it in. If you haven't already upload your image to an image sharing site like Imgur to get a link to it.
http://imgur.com/YVeu0rW
It doesn't seem to work.
That's because you linked to a page on imgur. It needs to be a link to an image file.
Cute sharks, though.
Well thanks, but how do you do that?
Oh, figured it out.