How can I turn off over the air sync settings on my Mac iPhone

Hi,

For some reason I am attempting to sync my iPhone with my laptop as usual but now in the iTunes app when I attach my iPhone and go to Info, it reads: Your contacts are being synced with your iPhone over the air from MobileMe. Over the air sync settings can be changed on your iPhone. So here is the thing, I have looked online and have found nothing at all to show me how to do this on my iPhone. I want to be able to add info on my iPhone and then connect it with my laptop and sync it immediately with my laptop and also to add info on my laptop and immediately sync it with my iPhone. Please help. Thanks 🙂