first, have you tried it? it works. you type a full name where it says 'full name'... etc. and how often do you do this? sorry, but i don't see the problem, it's as clear as could be.
yes of course i tried it. it's a confusing experience. (even for me being a Mac developer with a lengthy experience of using Macs).
editable text fields should clearly look like editable text fields, there should be no ambiguity or any guesswork on the user's part. poor UI decision.