What you’re looking for are called “Public Tabs”, and they’re only available with the paid version of the plugin. The following is a link to all the paid versions and their features: http://sensibleplugins.com/downloads/
Please let us know if you have any further questions.
By default, all tabs created by our plugin are available only to the logged in user viewing their own profile. “Public Tabs” are tabs that enable you to created tabs that are viewable by anonymous (not logged in) users as well. What you include in these tabs (a register page for example) is completely up to you.