Wow, that was painful.  Took me an hour.  The instructions don't say HOW to scan a QR code so I registered on my computer.  To register my copy of the book it asked when & where I bought it.  I don't remember that, I have had it a year or more.  I guessed, and then it asked a question on a page that doesn't exist for a recipe ingredient that doesn't exist for a recipe that doesn't exist in the entire book. 
So, back to the phone.  To scan a QR code you need an application on your phone.  I don't know, maybe all phones come with such an app now.  Mine didn't and I downloaded ShopSavvy when I got my phone so I tried that.  It registered but of course asked for the scratch code.  I entered it and the next result was 'error, page does not exist'. 
So, I don't know if I successfully registered my copy or not but I think I have spent enough effort on this.  Still, for that effort I expect the additional benefits of registration to include free food prepared in the Test Kitchen! 
Hope this all helps someone. 
...and now they want me to do math to post.  I was told there would be no math.