/** Add Custom Share Button */
function custom_share_main_button( $main_button, $post_id ) {
	$newsletter = 'Newsletter';
	$subscribe  = 'Subscribe';

	$main_button .= $newsletter . $subscribe;

	return $main_button;
}
add_filter( 'jnews_single_share_main_button', 'custom_share_main_button', 99, 2 );