Gift app with iOS 6
HOW DO I GIFT AN APP ON IPHONE 4S WITH IOS 6?
iPhone 4S, iOS 6, Gift app
Summary
If you want to gift apps for iPhone, iPad, or iPod touch, you must use the iTunes Store on a Mac or PC.
Products Affected
iTunes Store
Currently, app gifting is not available from your iPhone, iPad, or iPod touch with iOS 6. However, you can gift iOS apps from the iTunes Store on a Mac or PC.
Note: You can continue to gift apps in iOS 5 and earlier.
http://support.apple.com/kb/HT5510?viewlocale=en_US&locale=en_US