have no disk for bt voyager 210 and messed it all up

[djbenj1]

hi,
i've just bought a bt 210 voyager off ebay and it never came with a disk to install, it has been unlocked and i am using aol and want it to get online with my xbox360.
i'm crap with computers so like a typical bloke i just plugged the thing in and of course it didn't work.
then i read off the ebay page (which i should of done in the first place) the instructions,you should first load up the drivers etc off this site http://192.168.1.1 which i have tried and tried to get working but with no joy.
the error it comes up with is (http 500 internal server error).

1.is there a problem with the site or my computer?
2.if the site has a problem does anyone know how to load up the software for my router?
3.what do i do with my present bt voyager 105 usb keep it running while connecting the ethernet cable to the back of the 210?

i haven't got a clue what to do now i've only just got the thing back on the net after nearly buggering it all up
can anyone please take me through the procedure, even down to the cables as i dont know if to just unplug the other or use one off the ethernet and the other off the usb or vice versa.unistall the 105 then restart the computer etc etc etc etc.
thanks