Rename SSID / network name and password

> I would like to rename my SSID and change the password.

   Ok.  What's stopping you?

> It is connected to a wireless router.

   By "it", do you mean this:

> Model: CM400|DOCSIS 3.0 Cable Modem

   The CM400 is a cable-TV modem.  It knows nothing about wireless
networking.  That's a job for your (unspecified) "a wireless router",
about which the non-psychcs in your audience know nothing.