The gateways are different on different router brands.
to find yours, type cmd into start bar, press enter, the command prompt should pop up, type in "ipconfig", find "Default Gateway" and enter that into your browser and you should be redirected to your router's page if you don't have a password.
NOTE: If you don't have a password for your router, type in the username, "admin", and the password, "password", this works for most router brands.
I hope I explained this clear enough.