If the Community Builder social profile plugin is enabled, you should be able to configure it under Components > JFBConnect > Profiles > Community Builder tab. It will only show up if it detects that CB is installed (by looking for /administrator/components/com_comprofiler/plugin.foundation.php file). If the file is present, the profile plugin is enabled and you still cannot configure it in the backend, please let us know.
Thanks
-Melissa