Cannot add new icons

Hello. I try to add new icons as described

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;

}

But nothing works

Try to add

add_filter( ‘storm_social_icons_use_latest’, ‘__return_true’ );

But it doesn’t help.

How can I add new icons from fontawesome?