Nothing pops up

As stated on the front page:

This module currently works with themes that implement node templates with containing divs whose id attributes are of the pattern "node-%nid", where %nid is the node's numeric nid

So, in your theme's node.tpl.php, the opening container should be something like the following:

<div id="node-<?php print $node->nid; ?>" class="node<?php if ($sticky) { print " sticky"; } ?><?php if (!$status) { print " node-unpublished"; } ?>">

Note the id="node-<?php print $node->nid; ?>".