Existing iWeb on new Mac - how to get it?

Hi Folks!

I took ownership today of my shiny new MacBook. After being Mac-less for the past couple of months I was looking forward to getting back into iWeb and getting my wee website up and running again.

When I first booted it up it asked me if I was already a member and to put in my mac address.. at that point I lost connection to the internet and now when I boot it up it comes up blank as a new iWeb page and I can't get into my existing account. Can anyone help me please?

THanks,
AngieMac