If you need more info on the menu button and uninstalling apps look in the
Samsung manual.
As pointed out you get to the book settings for Moonreader+ by tapping the center of any page in a book.
From Moon+Reader FAQ:
Quote:
How to adjust reader options in Nexus 7, Galaxy Nexus or other android devices which haven't a menu key?
After you open a book, you can tap middle of the screen to invoke the reader bar for all customizable options.
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Since your device has a menu key I'm guessing you need to use it, but tapping the center still may work.
Any more questions feel free to ask.