access modem to control WiFi - XFinity

Modem Problem. I have two modems on line: the SB6141, that I use for internet and WiFi, and the TG1682G which I use for telephone which is working.
I need to open up the TG1682 in order to set the SSID and password, and to turn
off the WiFi when not in use. I cannot get access to the 1682. When I sign on to Xfinity I can only see the 6141.
Please give access to the TG1682 or the ip address so that I can control it.

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