For the Configure Clock Settings page, the default username is "admin" and the password is either "setup" or "update" (without the quotes). I'm pretty sure it's "setup" and "update is only for doing OTA updates.
Mark it on a piece of tape and stick it to the underside of your clock. I went to look it up for you but remembered it's no in any obvious place in the manual, so I just tried to log into my clock. Maybe Ian could remedy that in the next manual revision.