Within EasySocail's Facebook Configuration area, there is an option for "Use JFBConnect" (or something like that). If you enable that option, EasySocial will automatically add our social login buttons to their login/registration areas.
Beyond that, there is the Social Profiles - EasySocial plugin which should have been installed. Once enabled, you can configure the profile import features of JFBConnect in the admin Profiles area.
Additionally, in the JFBConnect -> Configuration area, you can set the registration component to EasySocial, if you want. That will let a user register with a social network but will send them through the EasySocial flow to fill out their profile details that can't be imported. This is useful if you don't want to use the auto-registration feature of JFBConnect and want the user to go through your standard registration flow to gather more details.
I hope that gives you a couple quick examples, but if you need anything else, just let us know.
Thanks,
Alex