Hi,
you have to edit the main.php in your template directory. Look for the following line:
<?php tpl_link(wl(),$conf['title'],'name="dokuwiki__top" id="dokuwiki__top" accesskey="h" title="[ALT+H]"')?>
and replace wl(), with something like '
http://yourlinkgoeshere.org' ( including the ' ).
--
chi