Unfortunately, you cannot post photos on this strictly forum based domain, parsimony.net.  Within a message, you can embed a photo that exist elsewhere (in the "image-url" edit box), which you can see being done by quite a few people here (lots of activity lately, eh?).

You can, however, create a free Yahoo Geocities website, upload photos, and then link to those photos from here.  It worked...  oops!  Well, that's bizarre.  Apparently, Parsimony.net has blocked the URL "geocities.c0m"!  So, you'd have to find a website with a different URL that allows free hosting of images, like "photobucket.com."

Have fun!

~Seamless~