welcome aboard... for your sig try :

{URL="http://www.ukaps.org"]{IMG]http://www.ukaps.org/images/Signiture1.gif[/IMG][/url]

or for html

<a href="http://www.ukaps.org" target="_blank"><img src="http://www.ukaps.org/images/Signiture1.gif"/></a>

you cannot cut and paste direct for the top one.. you need to change the { to a [ prior to the URL ad the IMG bits.

Pop to the website for details: UK Aquatic Plant Society Main Website