Can not get it to work…

I m using the latest version of wordpress and this plugin. I activated the plug in, created a facebook app, entered the app id, secret code and admin id. When I go to my page, there was no facebook comment box. The original wordpress comment box is gone as well. Not sure what I m doing wrong. Please provide some suggestions on what to check.

p.s. The link to creating a facebook app from the plugin setting page is broken.

https://wordpress.org/plugins/seo-facebook-comments/