Netgear NAS App

I have just downloaded and installed the iRedMail app onto my Netgear Nas.
The installation process did not require a Username or Password, however when I try to use the app I am being asked to login (username and app)

1. How do I login if I do not have a username and password?
2. Is there any documentation for this app (user guide etc)?

Thanks in anticipation

Regards
Carl