You can find your Wifi login ID and password if you look under the router itself. Both Comcast Xfinity and Centurylink have a sticker under the router that gives you the login info to login to your wireless
If you want to login to your cable modem so that you can configure your Wifi SSID and password or set up mac filtering, then here is the username and password for you.
Open your web browser and go to
1) Are you using a coax?
If you are using coax, then you can use the TV's settings for CC. Look on your TV remote. If there is a CC button, you may turn on the CC by pressing that button. If there is