// Register Default Headers function custom_default_headers() { $headers = array( 'mnoheader' => array( 'description' => __( 'CCN MNO', 'text_domain' ), 'url' => 'https://cirruscorenetworks.com/wp-content/uploads/2020/07/MNO-Webpage-banner.jpg', ), ); register_default_headers( $headers ); } add_action( 'after_setup_theme', 'custom_default_headers' );