In the BV Commerce Toolkit there is a place to setup users which I will be using for the "Private Store". In this there are options to add to member of (which I would call permissions). Does this work? and How does this work?

Also; what is the difference between a user here and an admin login?
Where can I add users to manage the BV Commerce Toolkit (content/site manager)?

I changed a user login and it affected the admin login password as well. I had to go to the user table in the db to see what the changed password was. I wouldn't think these two would be related, but....