How to stop someone from using my att wi-fi internet?

Question

How to stop someone from using my att wi-fi internet?

Answer 1

set a password on ur wifi  by going into ur router

Answer 2

pw

Answer 3

Set up a password on your router. That way everytime they want to log in, they must use the password.

Depending on your router, you can go to the website and change your information - including the password.  

Answer 4

put an encryption into the router. most used are WEP and WPA-PSK