About Creating and Managing User Accounts

When creating a user, you can specify which functionality the user can access by specifying security rights and by adding users to groups from which they can inherit permissions.

The system includes a built-in user named Admin. This user is a member of the built-in Administrators group and cannot be deleted, renamed, or added to other groups. The default password for the Admin user is empty.
Note: Change this password as soon as possible. Only users who should be able to access the system as the Admin user should know the password for this account.

If no users exist in your database, you will need to add a user to the CoreIdentity table in the MmsData database.