Need help with a 2Wire Gateway website

Wasn't sure where to upload this question to, but my family makes use of a gateway by 2wire and we have this website that we can access on one of our computers.

Problem is, we can't figure out how to actually access this website, which we use for controlling the kids' internet usage, on a new PC. We have it available on this one, old, PC but I've recently bought a new one and I can't figure out how to get this website available for use on the new one, as when I type in the URL that the site uses on the old PC, it just says it can't find it. Any help appreciated.

NB - posted this in a software forum (no clue where was best), and my computer language is very limited, so simple terminology would be appreciated!
 
Back