Neighbor hacked my wife! How do I change password

Also, can you explain what happened? What game showed up on your TV? Do you have a chromecast or a smart TV with chromecast built in?

Those instructions are only good if they use cox leased equipment 

Good point. I assumed by the OP's tone that they are the type to rent a gateway. Either way, the second link gives more general guidelines how to log into your router.

candee What model router do you have?

My working hypothesis is both folks may have never changed defaults which makes for interesting behavior. That may be why OP has slow wifi. I'm assuming setting a unique SSID and password will straighten things out.

Thinking about it, it's POSSIBLE with an unsecured TV, that in error the neighbor was streaming to a compliant video device and the TV picked up the signal and displayed it. It in fact may be a simple error. I would talk to the neighbor and let them know that somehow their gaming system started displaying on your TV. 

Hehe. I think they meant Wi-Fi. It is a common auto correct error. See it all the time on Reddit where people post from phones.

...and why is the wife "very slow"?

I also must be very slow because I don't see the common auto correct error.  What are people suppose to type?

When you type Wifi it sees it as a error(atleast in Chrome). When you right click on it, it gives 3 options; WIFI, Wife and Wi-Fi. A lot of people click on wife by accident. Either that or OP is married to a robot. Heh.

Oh, "wife'!  I thought the questioned term was "hack."  You know...OP typed "wife" so many times, I thought a woman was home unknowingly watching the neighbor's game on TV.

Wow...I was obviously HUA.