Access router config page

So I was given this CG3000 from a friend. I get my internet from an ethernet port in the wall which I connect to one of the lan ports. Right now I am able to connect computers to the router via ethernet cables and the wireless also works perfectly.

However, I cannot get into the routers config page to change the wireless password.

I have tried to use:

    Default gateway from ipconfig

    192.168.0.1

    192.168.1.1

    192.168.100.1

    10.1.10

Also I have tried a reset of the router and restarted all devices.

Does anybody have any idea as to what i might be doing wrong?