The user name and password in the portal ("My Services", then "View Technical Details") are the details you should use to set up the router. You have a separate user name and password to access the portal.
Zen sent out a username and a "connection password" that I used for the past two years previously. They sent the same email this time around with a username and a connection password.
Logging into the portal, there are two glitchy looking links: General (which does nothing) and Cancel a Service.
No technical details of the line available.