1) pick an image on a website to reference. if you want to use one of your own pics, you'll need a provider that will allow you to reference the images. currently free services like yahoo geocities & tripod will
not allow you to reference images.
2) code image posts this way:
[I M G]http://your911sux.jpg[I M G]
where i purposely left spaces between the I & M & G but for posting no spaces.