There are a few steps to integrate with EasySocial, described in detail
here
. But basically there are two settings in ES to get the JFBC buttons to be shown - "Allow Registrations" and "Use JFBConnect Buttons".
If you also want the JFBConnect social login buttons to be shown on the Joomla login page, JFBConnect has a "Integrate into Joomla Login" option in JFBConnect backend > Configuration > General area.
Additionally, you can use our SCLogin module anywhere on your page which can show both the form to log in via Joomla credentials and also the social login buttons.
Let me know if you still have trouble after trying the above suggestions.
-Melissa