How to make a picture smaller on iPhone 5 or Instagram?

I want to put a picture of myself on Istagram but my head won't fit in the slot on Instagram:|

Can i make the slot bigger or my head smaller?

I understand the problem and unfortunately you can't make the slot smaller. You MIGHT be able to reduce the photo's size on the 5, but I doubt it. Your best bet would be to reduce on a computer and email it to yourself. Or just take a new photo.