Rotate images with Meta Slider

Hi! I want to use the Meta Slider plugin for the header images. I have installed the plugin Linkable Title Html and Php Widget by PepLamb and added this code to the widget: <?php if ( function_exists( 'get_meta_slider' ) ) {
get_meta_slider('6420'); } ?>

I then added this code to the header area: <?php bfa_widget_area('name=Metaslider'); ?>

But I don' get it to work, the images doesn't show up at all. What am I doing wrong? I'm using Atahualpa 3.7.22 and Wordpress 4.1.

The website: http://voldarideklubb.no/