Right basically...
You need to find the code in the plugin that initiates the template manipulation, which I believe is something like:
PHP Code:
$text_ara = '$activeusers';
$vbulletin->templatecache['FORUMHOME'] = str_replace($text_ara,fetch_template('FORUMHOME_ColorGroups').$text_ara,$vbulletin->templatecache['FORUMHOME']);
Now you need to replace it with something like:
PHP Code:
eval("\$legend .= \"".fetch_template('FORUMHOME_ColorGroups')."\";");
Then in the FORUMHOME template, add $legend where you want it to display
Chris