markup broken on the discussion board?

I have an open discussion and tried to link a photo jpg image, but the image
doesn't show up in the post. Any clues please?

Link to the discussion post.

Here's the questionable code:

![PCIe error](http://tinypic.com/3ia4vnfr)

This help page here doesn't specify where or how
to upload a photo.

Apologies if this seems like a dumb question :)