I've setup the newsletter signup page and added the code [enewsletter_subscribe show_name="1" show_groups="0" subscribe_to_groups="1"]
So people can sign up to the general mailing list but not the lists for the memberships.
But on that page I can see the option for logged in users to check a box to register for newsletters associated with the membership groups I've created. They're not members of those groups because they haven't paid for them hence shouldn't see those details.
How do I only present just the form to require name and email then have the system add them to the general newsletter group I've setup?