The Sector Starter Kit includes preconfigured user roles, user profiles, and permissions, and out of the box, the ability to create, add, edit, or delete users is only available to the Drupal sitebuilder role.
Once you've logged in to your user account, you'll see the Administration User Interface (AdminUI). This has two distinct areas: the AdminUI overlay on the frontend of your site, and the AdminUI backend.
Sector 9 is out!
With Drupal 9 released, we have published our Sector 9 roadmap as well as completed the first release for Sector 9.