Out of curiousity, does your assignment use these
directions? The problem might be, that it was written for
FreeNAS 0.7 (project now known as NAS4free and supported on nas4free.org) and it's a different product than what seeing, by downloading the latest FreeNAS. If this is the case, you might want to download the old version and install it. We can't help you with that version here (imagine taking a Lexus to a Chevy dealer), but it might help point you in the right direction.
I saw your bookmarks for MVNU and did a Google search.