Take a look at the guides listed here:
http://forums.d2jsp.org/info.php?p=15You need to take a screenshot and upload your picture to one of these image hosting sites
www.photobucket.com
www.imageshack.com
www.tinypic.com
Once uploaded, take the direct url and put it in image tags here while creating a post by clicking this
Should look like so:
Code
[IMG]direct link here[/IMG]