The Stonewall Kobyashi Maru Challenge!
That was fun.... I'm trying to figure out how to post the screenshot I took :(
Voleron wrote some pretty good instructions up at the top of this post. I've tried with other services without much success, but Snaggy works. You can also just go to https://snag.gy and drag and drop your screenshot to upload it there.
After it's uploaded it'll give you a URL to the image. Just hit the button with the little picture icon up above the edit box (5th from the end on the buttons) and pop in the URL Snaggy gave you.