Perito: This is your default gateway of his router. He cann access it, if it's the correct IP and he has all settings enabled to connect to it and the router works.
Starman: Yes, you cann access it through wireless, I have done it many times, also the username and password is not something you get from your ISP it's default per router manufacturer. He can google it for the correct username and password. What I am guessing is either the router is not working or he's got the wrong gateway.
989133- We need the model, make. It could be a gateway of 192.168.1.1 it all depends. Try restting your router, there should be a reset button on the bottom of the router, after you reset the router it will be completely be unsecured. Try going into your wirless app. And connect to your router it should reset the SSID so it won't be named the same as it was. It will ask that it's unsecure and if you still want to connect, and push yes connect anyways. After you connect to the internet. Type 192.168.1.1/192.168.0.1 it should then pop up a sign in prompt.