Small pics can be attached directly in the posting window.
- Click Additional Options
- Click Browse to locate the file on your hard drive.
- Click (more attachments) to add multiple attachments (limit 3)
Attachments have a limit of 100KB each.
If you have more images or larger images. Host them on a site Flickr or TinyPic (requires no login or registration). and then use the "img" tag to display the image.
So this
[ img]http://www.elasmo-research.org/education/topics/topic_images/manta_dance.gif[/img]
Would display this (there should be no blank spaces between the square brackets and the tags).

Hope that helps.
ATB,
Sam