Here's a link to the old 'HTML bootcamp' thread from Nov. 2000. It should still be good information, since you do have to use HTML to post pictures from a different site.
http://www.freerepublic.com/forum/a3a1e6b7134bf.htm
Are we sure we want to enable Congressman Billy the power to post pictures? Admistrator Moderator, please delete my informatative posts above before "loose lips sink ships".