DSA392N Modem? Not on your list but Cox supplied the Modem

I just got Cox Internet and phone service.  The WiFi Modem I have is listed as a DSA392N.  I would like to change the modem name and password if I can, but when I go to look for the instructions for this modem, it is not listed on the list of Cox modems.  Cox supplied this modem, and the installer couldn't give me any information about it.  I have had some service drops and it seems to be when we get phone calls. 

Where can I get information to access the modem and it's settings for security and other settings.