So far, you only have one user - the administrator that you set up during the installation. You probably want some other users to be able to create their own scans and work with the results. To manage all settings associated with users, from the burger menu, open the "Team" page.
From the "Team" page, you can create new users and assign them different roles. You can even restrict users' access to certain sites and folders.
For a detailed explanation, please refer to the main Burp Suite Enterprise Edition documentation using the link below.