How to change the sorting of the Magazine Element.

Hey DROR,
Try adding this code to the end of your functions.php file in Appearance > Editor:

add_filter('avf_magazine_entries_query', 'avf_magazine_entries_custom_query');

function avf_magazine_entries_custom_query ( $query ) {
$query['orderby'] = 'rand';
return $query;
}

Please see Order & Orderby Parameters for more options

Best regards,
Mike