Using BeBox with a different ISP

[Ascendancy]

Ok, so I've moved house and I can't get BeUnlimited here so i've gone with Tiscali, however my Net connection was activated today, but my router isn't coming until next week. So what I want to know is, is there any way I can use my Bebox to log into tiscali broadband? I have my Tiscali username and password, I just need to figure out where to put them in the bebox, I assume i'll need to upgrade the firmware or something.

Thanks in advance