Do you have an account with a photo hosting site like Flikr? (I use SmugMug, which is similar.) I think the easiest thing to do if you have one is to use the 'insert image' tool (under the bold text button above left) to post a link to the photo on a site like that - there should be a way to get an embeddable link to the image from the hosting site. As for directly uploading to this site, I'm not sure if you can or not as I've never tried.
Good luck!
-Pat