function add_roles() {
  add_role( 'bronze',
            'Bronze',
            array( 'read' => true,
                   'edit_posts' => false,
           'delete_posts' => false, ));
  add_role( 'silver',
            'Silver',
            array( 'read' => true,
               'edit_posts' => true,
               'delete_posts' => false, ));
  dd_role( 'gold',
           'Gold',
           array( 'read' => true,
                  'edit_posts' => true,
          'delete_posts' => false, ));
}
// add custom roles
add_action('wp_footer', 'add_roles');