If you have a question about a specific set of Boom Cards... or if you think you have found a problem, want to make a suggestion, or even to request new features for a follow-on set of Boom Cards you should contact the Author directly.
The easiest way to contact a seller is while you are previewing a deck. There is a "feedback" button in the lower left corner during preview.
The wonderful thing about this method is it will show the author exactly which card and deck you were looking at. So for instance, if you think there should be more than one correct answer on a specific card, if you tap the "feedback" button while viewing the card, your author will know, unambiguously, which card you are talking about.
Another way to contact a seller is from the "Library" tab. Tap the "Action" button, then "Contact Author".