You ought to be able to make your signature by amending your profile. If the function is working correctly then my personal quote was just added to my signature as follows:
When I look in the mirror, I am happy to see, some of that nine year old boy, who used to be me. (My very own personal quote!<img src="http://www.faunaclassifieds.com/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='
'>
If you see that in my signature below the function is probably working correctly, if not maybe you should contact the web slave.