If you're new to reviewing on Barnes & Noble, follow these steps to leave your review on their website and prove to Booksprout that you've completed your review.
Click on the "Leave Your Review" button just under the Barnes & Noble heading. It should take you directly to the book's review page where you can leave your review.
Once the page fully loads, you should see a prompt to "Write a Review." Click that button.
Follow the prompts to leave your review on Barnes & Noble.
Once completed and you can see your review on their website, come back to Booksprout and click the "Yes, I left my review" checkbox in the Barnes & Noble section.
Scroll down to the bottom and click the "save" button.