Go to the users menu, and move to the registraion tab and then select the user type as ROLE_OPERATOR and enter the name and username.

After submitting the data you will have the username and a temporary generated password. The temporary password helps to complete the account with the real password for the real user.

After creating the operator user account, the super admin or an admin can manage the access for services like if the new operator can access all the services or not, or it can be added to specific services one by one. As an example if you want to have an operator user for the payment-account-service service, you can mention that user can only access the payment-account-service.

When trying to log in with the temporary generated password the user will be asked for creating a new password for activate the account. Then the real user of the admin account can give their own password and create the account.