how do I hide or edit the @name ?

In a BuddyPress profile, there’s an @name that shows. My system seems to be taking people’s emails and putting them in there. This totally defeats any notion of privacy. Can this be hidden or can the field be easily edited? H

My own is @admin, yet I can find that anywhere in an editable profile. I’m just wanting to use BP with QA to allow people to customize their avatar.