Can't get RSS Icon

hello.

i can’t get a usual RSS icon.
i insert that code from example into functions.php, but it isn’t show me standard RSS icon – http://imgur.com/X99tqJB

add_filter( 'storm_social_icons_networks', 'storm_social_icons_networks');
function storm_social_icons_networks( $networks ) {

    $extra_icons = array (
        '/feed' => array(                  // Enable this icon for any URL containing this text
            'name' => 'RSS',               // Default menu item label
            'class' => 'rss',              // Custom class
            'icon' => 'icon-rss',          // FontAwesome class
            'icon-sign' => 'icon-rss-sign' // May not be available. Check FontAwesome.
        ),
    );

    $extra_icons = array_merge( $networks, $extra_icons );
    return $extra_icons;

}

I try to replace the lines to

'icon' => 'fa fa-rss',          // FontAwesome class
            'icon-sign' => 'fa fa-rss-square' // May not be available. Check FontAwesome.

but it’s won’t help.

I also made this insert in the functions.php:

add_filter( 'storm_social_icons_use_latest', '__return_true' );

https://wordpress.org/plugins/menu-social-icons/