see the "Creating your database connection in Dreamweaver" tutorial on the learning resources page:
The social media toolkit does not have support for paginating the messages.
I'm not sure i understand your question about the login and registration pages.
If you use the security assist wizard to create the login and registration, you could add a link to the registration page to "link them up" the same as any other link:
<a href="registration.php">click here to register</a>