Register with Facebook button

I'm assuming you mean the standard Joomla registration form? If so, then there's a few ways to update the position.
First, there is an option to set the buttons to the top or bottom (or even both) in JFBConnect's Configuration area. Look for the "Integrate with Joomla Login" setting to configure the position.

If you want total flexibility, you should disable the Integrate with Joomla Login setting. Then, create a template override for the /components/com_users/views/registration/tmpl/default.php file by copying that file to /templates/<YOUR_TEMPLATE>/html/com_users/registration/default.php

Edit that new file and wherever you want the login buttons to show, add the following tag:There's lots of additional parameters you can add for choosing which providers show or what image is used, but that should get you started.

I hope that helps, but if you have any other questions, just let me know.

Thanks,
Alex

Awesome! I'm glad to hear that helped get you going. If you need anything else, don't hesitate to get in touch.

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks,
Alex