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It is always a good idea for readers to provide feedback to the authors. When authors read their work they don't get the same experience as the reader. Most books' authors will have a way for you t...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/12807 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It is always a good idea for readers to provide feedback to the authors. When authors read their work they don't get the same experience as the reader. Most books' authors will have a way for you to contact them about their books. You said it has a forum; you should see if that is an appropriate place for suggestions on the book. If the author has a personal website you can find their contact information there.