You can add more users to allow an alternative email address to login. This uses the same Breeze Account, and multiple logins cannot be used for translation at the same time.
From your control panel page hit the menu, and select setup.
On the setup page, hit the menu and select Add Additional Email Account
In the pop-up, add their email address and password. They will be able to reset their password by choosing 'forgor my password' on the login screen