Accessing Contact Book from application

I want to access Contact Book Features from my application (i.e) Add,Edit and Retrieving the data. Iam using the ABPeoplePickerNavigationController for getting the records from contact list but did not find to save and edit them.

please suggest the solution.

Hope this will help you http://developer.apple.com/library/ios/#documentation/AddressBook/Reference/ABAddressBookRef_iPhoneOS/Reference/reference.html