First, please double-check to see what your default username/password settings are by going to Options and Settings > Default Username and Password. When adding a new employee, make sure the fields selected as default settings are filled in when initially adding or importing the new employee.

Then you may go to Export and Email > Configure Automatic Email > New Employee notices to enable due notices to New Employees. Please make sure the Login Link field is populated with your Web interface login link. The temporary password and username will be included in the email automatically.