Jezebel,
Take the URL for the picture you want to show, put "[img]" in front of it (without the surrounding double quotes), and put "[/img]" at the end of it (again, without the surrounding double quotes I typed):
appears where I would have placed
[img]http://www.geocities.com/m_jezebelle/shoe1.jpg[/img ]
in the text of the message (I deliberately put a blank space in the above expression between the final letter "g" and the closing "]" , so that the picture would not be shown a second time - that blank space does not belong there really).
In your case however, the picture might not appear directly on your screen, because it resides on a Geocities server. You could instead try to upload those 4 pictures to the server
http://65.160.96.70/hhplace/ instead. That server has been made available for the purpose of posting pictures on hhplace.org - see the following post:
http://www.hhplace.org/hhboard/viewtopic.php?t=823