problem with http://embedarticles.com/

I tried downloading and activating the embed articles plugin, but all we get when we click the embed option or when we go to your web site (http://embedarticles.com/login/) is

502 Bad Gateway

nginx/1.6.2

see example – http://yourdentalhealthresource.com/root-canal-painful/

any insight?

https://wordpress.org/plugins/embed-articles/