I've already enabled the option into my links.cgf file:
# Detailed View: The script can build a single html page per link. This is
# great if you have a review in your database. To enable, you must set
# the directory where all the pages will be stored, the url to that directory
# and set the enable option.
$build_detailed = 1;
$build_detail_path = "$build_root_path/Detailed";
$build_detail_url = "$build_root_url/Detailed";


Un the template link.html I have the following html code:

<%if Details%>
<a href="<%build_detail_url%>/<%ID%>.html"><%Title%></a>
<%endif%>

How do I activate the little square detailed..??
Thanks for your help.