/** 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 );