Not a stupid question at all - we all asked it at one point.
Load the picture up to some web space elsewhere - you do need a little web space for this to work. Use an FTP cliuent such as WS-FTP to load your picture up. Take note of the web address of the .jpg image and then insert it in an
 address in here (/img)<br />NOTE: Use square brackets and not round for this to work.<br /><br />The result is this [img]http://www.philiprolt.pwp.blueyonder.co.uk/ehm1.jpg)
Look forward to seeing your images posted here.