Hi @Elizabeth B, welcome to the Box Community!
Editing managed users on your account won’t affect the overall number of users unless you add a new managed user with a different email address.
It’s possible that you hadn’t noticed this before, but based on our records, you currently have 2 internal users (an admin and a managed user) and 1 external collaborator. A collaborator is someone invited to a shared folder. Based on your account type, collaborators count towards the seats used, and this brings your total to 3 users.
Note: All business and enterprise-level accounts come with a minimum of 3 seats, as these plans are designed for team or organizational collaboration.
To view and manage your users, just head over to your Admin Console > Users & Groups.
If you'd like to remove a collaborator from a folder or file, you can find a helpful guide here: Removing Collaborators.
Have a wonderful day! 