Hmmm...
For a Screen Shot, I suggest you use your keyboard's Print Screen key, paste the image into Paint, or some other image editor, and save it as a JPEG. Then, you can use the "Additional Options..." using the Reply button immediately below (not the Quick Reply box at the very bottom), which allows you upload the JPEG.
Alternatively, you can use a free webhosting site, like
www.imageshack.us, and include a link to the site. Like this:
You can click on the above thumbnail to see a larger image.
By the way, what are the material settings for your object(s)? Have you
ever been able to render in colors? What happens when you add lights?