Hi Darren, welcome to the T-Shirt Forums!
http://www.t-shirtforums.com/faq.php?faq=vb_faq#faq_custom_avatars_on_tshirts
See this link:
http://www.t-shirtforums.com/faq.php?faq=vb_faq#faq_custom_avatars_on_tshirts
See this link:Also how do I create a signature?, cannot find anyway in the options in my control panel to add one.