Can't get free ebook

I received a coupon for one free ebook when I participated in the 2012 Maker Faire as a Maker in New York. I created an account, but how I can get that 1 free book is not immediately obvious. I wanted to get 'Visualize This' by Nathan Yau. Can you please help? My username is jlar0che and my email is jlaroche@gmail.com

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