There is always only the cancel button ... you have to confirm the transaction with the link send by email to you, but I think after several days (maybe 5?) there will appear a confirm button anyway.
Heh, I just realized that and came back to say that all was indeed OK -- it showed the confirm button when I loaded the site from the link received in e-mail when the time the transaction started.
I was used to the old system (my last trades on Bitmarket before the current one were in September), where the "Send BTC" button would be always visible.
(So I sent an e-mail saying that all was OK to the buyer and the administrator too. Sorry for any hassle. I hurried because the downtime delayed me somewhat and forgot about the link in e-mail. :) )