There's a few ways to do what you're looking for with both JFBConnect or JLinked, I think. However, can you explain a little more about the "Register to read more" link? Is that something in your template, from a component, or somewhere else? Generally, it's pretty easy to add our Login buttons to content, just need more information on where you want it. If you have URL to your site that we can see, that'd be very helpful.
Finally, please post from the account you subscribed from. Priority support is for active subscribers to our products.
Thanks,
Alex