Ahhh... okay, I got it wrong.
http://www.elkarte.net/community/index.php?topic=1114.msg7919#msg7919
This addon is the one we are using here, you can install it and then modify to suit your needs, for example if you want the button after "new replies", you could change
$buttons = elk_array_insert($buttons, 'home', array(
'base' => array(
'title' => $txt['home_btn'],
'href' => $parsed['scheme'] . '://' . $parsed['host'] . (!empty($parsed['port']) ? ':' . $parsed['port'] : '') . '/',
'data-icon' => '',
'show' => true,
'action_hook' => true,
),
));
to:
$buttons = elk_array_insert($buttons, 'unreadreplies', array(
'base' => array(
'title' => $txt['home_btn'],
'href' => $parsed['scheme'] . '://' . $parsed['host'] . (!empty($parsed['port']) ? ':' . $parsed['port'] : '') . '/',
'data-icon' => '',
'show' => true,
'action_hook' => true,
),
), 'after');
}