I managed to confirm my order. I had to refresh pages sometimes because Cloudflare would kick in. It took a bit, but I did manage to accept and confirm the order is now "Processing".
Hmmm, my order has said "processing" for quite a while. I can't get in, but I wonder if it'll be asking me for confirmation or not.
It will ask the moment you log in. A popup window will appear. The order status at this point is something along the lines of "Waiting for acceptance"... or something like that. Once you agree, it will go back to "Processing".
Mine didn't. I finally had the option to upgrade to express shipping a couple of days ago, so I did so. My status currently is "Upgrade Pending", and previously was "Processing". Hopefully I don't get a nasty surprise by not being able to confirm my order.