Stephen,
JFBConnect will automatically put the user's name and email address into the Joomla User Manager when they register. If you want to get this information out, there's are tools available to export to CSV or other formats:
extensions.joomla.org/extensions/migrati...sers-import-a-export
If you're using a newsletter component for Joomla, most of them will (or at least should) use the core-Joomla user table for getting that information, so they should work automatically.
Hope that helps, but if you need more help, just let us know,
Alex