Or rather, at the time of writing (14.55 on 20-2-08, with the debate now closed) you can't - because STEP managed to submit not one answer that was published on the site in the hour we had available - and I submitted all eleven of mine in the time provided.
But then what do you expect? They don't really believe in a level playing field. The answers they will post will all be provided with the benefit of having seen mine. How convenient for them. How typical to not play by the laid down rules, I'd say.
I have made my complaint known to the FT.