and in your replys?

If you click that Ubb code is enabled link on the right of the posting screen it has all the instructions
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><table border="0" width="90%" bgcolor="#6A7FB8" cellspacing="1" cellpadding="0"><tr><td width="100%"><table border="0" width="100%" cellspacing="0" cellpadding="2"><tr><td width="100%" bgcolor="#2f2f4f">To add a graphic within your message, just encase the URL of the graphic image as shown in the following example.

[img ]http://www.infopop.com/artwork/footer_logotype.gif[ /img]

In the example above, the UBBCode™ automatically makes the graphic visible in your message. Note: the "http://" part of the URL is REQUIRED for the [img] code. Also note: some UBB forums may disable the [img] tag support to prevent objectionable images from being viewed.</td></tr></table></td></tr></table></BLOCKQUOTE>To make one for your sig just click profile on the top of the page. Be sure to pay close attention to the rules for the pictures.
The picture needs to be on a online server before it can link to the site.

jontflesh