I just had a quick look (seeing as I set it up for you a while back), and it looks like you're using the wrong tag
<li><a href="<%db_cgi_url%>/modify.cgi<%if t%>?t=<%t%><%endif%>">Modify a Link</a><br />Change a link in the directory that you submitted.<br /> </li>
The part in red should be:
<%db_cgi_url%> won't work as you are expectig in GComm, as its a seperate script :)
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