This will allow you to open people picker and select information from the contact. I don't know what information you need but you get the idea.
- (void)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker didSelectPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier {
            [self peoplePickerNavigationController:peoplePicker shouldContinueAfterSelectingPerson:person property:property identifier:identifier];
        NSString *contactName = CFBridgingRelease(ABRecordCopyCompositeName(person));
        self.nameField.text = [NSString stringWithFormat:@"%@", contactName ? contactName : @"No Name"];
        ABMultiValueRef phoneRecord = ABRecordCopyValue(person, kABPersonPhoneProperty);
        CFStringRef phoneNumber = ABMultiValueCopyValueAtIndex(phoneRecord, 0);
        self.phoneField.text = (__bridge_transfer NSString *)phoneNumber;
        CFRelease(phoneRecord);
        ABMultiValueRef email = ABRecordCopyValue(person, kABPersonEmailProperty);
        CFStringRef emailField = ABMultiValueCopyValueAtIndex(email, 0);
        self.emailField.text = (__bridge_transfer NSString *)emailField;
        CFRelease(email);
        CFDataRef  photo = ABPersonCopyImageData(person);
        UIImage* image = [UIImage imageWithData:(__bridge NSData*)photo];
        if(photo)
            CFRelease(photo);
        if(image)
            self.myImageView.image = image;
        [self dismissViewControllerAnimated:YES completion:nil];
        return NO;
    }
       -(BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker
             shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property
                                     identifier:(ABMultiValueIdentifier)identifier
        {
            [self dismissViewControllerAnimated:YES completion:nil];
            return NO; }