Trying to set up wireless router but username/password doesn't work

[Nikmalev]

I'm trying to set up a Billion, Bipac 7300G wireless router, and i was told that must go to this site and type in the default IP address into my address bar.

http://www.speedguide.net/broadband-view.php?hw=184

So i do that and then i'm asked for a a username/password, the website tells me the default username/password is admin.

But when i type that in it tells me it isn't valid.

So if that's not the default username/password, then what's it been changed to? And is there anyway i can find out what's been changed to?

Forgive me if i seem a bit lost but i'm new to this kind of stuff.

Thanks in advance, -Nik