If you're using the standard Joomla registration page, you can simply enable the "Integrate with Joomla Login" setting in the JFBConnect Configuration area. That will add the social login buttons to the registration and login pages.
Additionally, there is a language string you can use to add whatever text you want before the social buttons, which is great for explaining what they do.
I hope that helps explain, but if you have any other questions, just let me know.
Thanks,
Alex
Social integration on registration page
