...
Username: The system generates a username based on the ‘Username format’ setting, which can be found via Module settings → Masterdata → Users tab. However, you have the option to change the username and password by using the ‘Change username/password’ button.
Default Usergroup and Profile: If a default user group and/or default user profile is set in the Module settings → ‘Users' tab, the user group and/or user profile will be automatically assigned to the newly created user. User groups and user profiles determine the user's access to specific modules of the system. Without them, the user won't be able to log in. More information on user groups, user profiles, and how to assign them can be found in the 'Authorizations’ section. see Authorizing users.
User License: A user license is automatically assigned to the new user based on the default setting in the Module settings → ‘Users' tab. You can also directly modify this value using the 'User Licenses’ dropdown menu on the user page. For detailed information about user licenses, refer to the User licenses section.
...
For more information on the other basic user settings, see: Personal settings
...