Not facebook members cannot register

If someone that is NOT facebook registered wish to register into my blog she/he cannot!
I tried several times but it doesn’t work.
I’d like to let people not having a facebook account to register into my blog.
Please check yourself:

https://lnx.sinapsi.org/wordpress/wp-login.php?action=register

Thanks.

https://www.ads-software.com/extend/plugins/simple-facebook-connect/