how do i change my wifi name and password

I think hard is a relative term. What makes it complicated though is there is no one way, since the wifi name and password isn't controlled by Cox, it is controlled by the router/gateway. What kind of device do you have? Usually the model number will be on the front of the device, or on the back and bottom on a white sticker. 

If you have Netgear CG3000D, in the user's guide at page 11 you can find the info you need. This is a screen shot: