Stick it into a slot. It's in Phoenix, AZ. I know it's Chip & PIN, because if you swipe it will beep and say "Card Must be inserted!"
Obviously you're right!
Moreover, after I wrote the question, I've found that lots of people have mentioned using chip cards at Walmart.
Some have also said that if you hit the green button without entering a PIN, it switches to asking for a signature.
Very interesting about the "card must be inserted", too! Looks like we're all in for some changes soon.
Oh. Question: were you allowed to choose your own PIN?