Hi!
The iCal importer is actually in closed beta right now – it’s not publicly available and although the new user primer is indeed publicly visible it’s not something we have linked to from elsewhere on the site as far as I know (did you simply find it via a Google search or similar?).
I apologize for the confusion in any case and we’ll certainly add a note to the top of that page to make it clearer that it isn’t ready for public consumption just yet. Thanks for pointing this out!
Does that clarify things here?