Scott:
You can upload the files to this website.
Easiest way: just do the attach file thingy at the bottom of your post, if you want to upload a jpg from your home 'puter. Don't know why it is not going for you, but it will attach it automagically. (Note: I click on the browse button to get it to point to my pictures.)
If you wish to link to a picture that's already on the net, then you can do this:
{zmg}
http://www.websitename.com/blah.jpg{/zmg}
just replace the '{' and '}' with '[' and ']' and replace the 'z' in ZMG with i. (for image)
Hope this helps!
-Zoltan.