Sign up for a free picture host account at Image hosting, free photo sharing & video sharing at Photobucket

Upload the photo by hitting browse and finding the photo. This will create a URL for the photo. Copy the URL.

Then, when you go to make a post here on MC (!), make sure that it is on 'go advance' and click on the little mountain at the top of the screen.

Enter the URL, starting with the http:// and enter.

Preview to see if it worked?

Hope this helps. It gets easier after the first couple of times...