Open Sources/Subs-Highlight.php, find
$hl = preg_match('/topic|msg|action=post|action=recent|action=unreadreplies|action=admin/i', $_SERVER['REQUEST_URI']) ? true : false;
and replace with
$hl = preg_match('/topic|msg|action=post|action=recent|action=unreadreplies|action=admin|action=kb/i', $_SERVER['REQUEST_URI']) ? true : false;