Yeah, that i can find.. there is no guess access setup via the web interface...
Must be blocked out for some reason..
Remember with a guest access account, it will not be SECURITY enabled, like with a password like a normal security enabled ID.. It will allow anyone to connect.. but then to access out, will have to enter the password, via a webpage which should come up automatically.
Bar necessarily swaping the WHOLE modem (as you would then need likely to wait for the new firmware upgrade again, etc.. would be to go to a rogers store, and see if they can supply you with a proper key (from another modem package even, etc).