Thanks Addie. I will try again when I get home. From memory though, I followed the instructions from the booklet, went on to register.fon.com, typed in the MAC & pin code and completed the forms, adding my username and password and then, when prompted, my geographic location resulting in a map appearing to show the signal coming from my address.
I didn't link to Facebook and tried and failed to download the apps that would work on my iPad and Nexus.
I believe that all of the screens etc. gave me the impression that I was registered and connected.
I have just received a help desk response which says that my box is not registered and they have sent me this link to show how it is done: Broken Link Removed
This is the same procedure that I followed.
I will try again and thank you for your patience.
Actually, that's a valid point - the instructions I wrote are for the 'old' fonera - but looking at this page you can still configure your Fonera via its web interface.
A more detailed version of what I posted is here. I would recommend following this, rather than using the method of entering your MAC address and password on the FON website.
Broken Link Removed