Can't log on to Changing wireless channels on super router HG633

Hi,

I have been trying to change my wireless channel but when I go to http://192.168.1.1 

it says to log in with the default password and user name which is admin but when I try it says that it is incorrect. I've tried putting in the router name and password that is on the back of the router as well but with no luck.

any help would be great.

Thanks