I have read that the default Sky username is admin and password is sky, have you tried these yet?
If that doesn't work you can reset the router. This will remove any configuration that is currently in place and reset the router to factory defaults. To do this use a paperclip or similar item to hold down the reset button on the router for about 10 seconds. The router should reboot and come online with default settings.
After this is done connect your computer to one of the LAN ports and go to http://192.168.0.1 and configure your router.