Membership rules don't show pages or posts

I'm interested in setting up access rules for my site, and when I look at the videos, I see how new rules can be dragged and dropped into one of positive rules, negative rules, or advanced.

When I attempt to do so on my site, however, there is nothing listed under "Main rules", "Content rules", etc. - the boxes are empty.

What am I missing? I don't see how I can set up the rules for use.

Thanks,

Dennis McNeely