#12 Books, Books, & More Books

I was interested in the "iStoryBooks" app. I downloaded the app, and can open the books, but the " read to Me" does not work. My grandchildren are 5 & 2 and love to listen to books.. Any suggestions to get this to work? The volume on my Nexus works good for games etc. Will have to again play around with it, and see what I can accomplish..