How to get a usb midi controller keyboard to work with the irig for the iphone?

I got a korg usb midi controller keyboard for Christmas. I have some great samples but there's a b3 organ app I have for the iphone that I'd love to use the keyboard on as it's midi controller compatible. I bought a midi to usb cable, an irig connector for the iphone, and loads of other leads but I still can't get the keyboard to receive power from the phone is there a way to do this?

You yell at it in chinese