1. First find "Settings" in the IOS device and click "General";
2. Secondly, find "Restricted Access" and set and enter the password for access restriction;
3. Then scroll down to find "Books", and you can see "Books of the following levels are allowed". Just turn off this button;
Apple is an American high-tech company. In the fiscal year of 20021,Apple's revenue reached US$ 365.8 billion, which was founded by Jobs, Stephen Gary Wozniak, Ronald Wayne and others on April 1976 and named AppleComputerInc, and was launched on October 9, 2007.