Specific Membership Configuration - view excerpt on homepage + popup to register

Hi... I am at the beginning of configuring the membership plugin for a new site. All memberships will be free (for now - this may change in the future). As such, there are really only two levels - registered and not yet registered.

Visitors at both levels should be able to see the excerpts on the home page. When they click to continue reading, we want a pop-up box prompting them to login or register (assuming they are not already logged in). Once they complete the login or registration, we want them to be directed to the page they were trying to view in the first place.

I've got it to the point where not yet registered viewers are unable to see the excerpts on the home page. Can you point me in the right direction to get that corrected?

Many thanks,
~KJ