Bunna, so sorry I didn't see this until now!
If you look on the top right hand side of the screen there should be a little ad for Amazon. Might be orange. If you click on it, you'll go to Amazon. You need to buy the book while you're there to give part of the purchase to 3FC ( Thank you!!!
). It'll happen automatically as long as you click through to Amazon from the links on 3FC. You don't have to do anything else.
Let me know if you have any other questions, okay?