Freezes; unable to use on iPad

We purchased this so that our kids could use the app on their iPads. You have to login everytime you want to access the settings or parent section. There should be an option to turn this feature off. The app is feezing at lesson 7 in the book section. My daughter cant move forward. There is no way to load and read this book. Worthless. Please fix or we will have to get our money back and report to BBB.

jawebster about ABCmouse: Reading & Math Games, v5.3