How do I add required check marks at the jfbconnect registration page?

JFBConnect doesn't have a built-in way to add additional fields. You'll need to use a 3rd party extension (like JomSocial, Alpha User Points or EasySocial) or the standard Joomla User - Profile plugin to add those fields. Once those extensions (or plugins) are enabled, enable the corresponding Social Profile plugin that comes with JFBConnect. Then, in the JFBConnect -> Profiles area, you can configure how the fields from those extensions will appear on the registration page.

I hope that makes sense, but if it's a bit confusing, just let us know.

Thanks,
Melissa