What is the description and location of the issue? You can put multiple items in here...if you're on an eReader, enter location instead of chapter, and info that might help us track down the issue.
This would be the hardware you're using, like "Desktop Computer," "Kindle," "iPad," etc.
When you launch an app to read, what app are you using? For example: You chose Nook above, but you're running the Kindle app on your Nook, choose "Kindle." You're using an iPad, but using the Kindle app instead of iBooks...choose "Kindle."