Maaz,
JFBConnect doesn't automatically add the social login buttons to the registration page of Joomla. That will be added in the v5.2 release, coming out next week. Until then, I'd say to just wait, if that's alright. If you need them there now, we can help you add them with some code changes, but then you'll need to undo that change with the next release.
I hope that helps,
Alex