Right now, JLinked can't automatically create an account on registration. That's something we'll be adding in the next release, v2.1 which should be out later this month or early July.
Until then, you'll need to display the 'mini-registration' page with some fields displayed.. either name, username, password, or email. Once the new release is available, there will be an option to automatically create the user account and import their profile information.
I hope that helps explain, but if not, let us know. If you need help styling that page (for now) or any other help we can provide until the new release is out, we can help.
Thanks,
Alex