turn facebook user into my user using facebook registration

I've integrated Facebook Registration Plugin into my website. Now, i was wandering if it was possible turn facebook user into my-website user, possibly with different password.

I'm looking for somithing different from "login with facebook account". I want people will registrate in my web site with their facebook account, after i want people login into my web site with their persona开发者_JS百科l login, obtained with the facebook registration

I've already read the guide, but , for my opinion, it isn't clear about this argument.

Thanks Alessandro