here is my link where it will go
<li <?php if ((($this->params['action'] == "admin_index" || $this->params['action'] == "admin_view" || $this->params['action'] == "admin_edit") && $this->params['controller'] == "users")) { ?>class=“active” <?php } ?>>Manage Users
here is my config>routing
Router::connect(’/admin’, array(‘controller’ => ‘admins’, ‘action’ => ‘login’, ‘prefix’=>‘admin’, ‘admin’ => true));
Router::connect(’/’, array(‘controller’ => ‘users’, ‘action’ => ‘index’));