WordPress comments box dissapears

Hello. I have installed the wordpress plugin in this web:
http://www.easycookclub.com/2013/12/christmas-tree-with-nutella-filling-with-thermomix/

The wordpress comments box disappears with the plugin activated. I want to keep this box to allow post comments to users that not have Facebook.

Is this possible?

Thanks

https://wordpress.org/plugins/facebook/