Q&A Plugin - User Profiles and Subscriptions

I'm very confused about this functionality.

When it says "dedicated user profiles", what is that referring to? Is it just the "Q&A" settings at the bottom of the normal wordpress profile?

Also, are the subscriptions all or nothing? In other words, either you subscribe to all new questions or none at all? Is there a way to subscribe to just one category, just questions you asked, etc?

Thank you.