How to unlock my rotation on iPhone 4S with iOS 7?

I have updated my phone to the iOS 7 and I don't know how to unlock my rotation on it. How do I do this?

Do you mean the portrait orientation thing? If so, if you swipe upwards from the bottom of your screen, the control centre should show and you'll see the button for it there

Swipe finger from home button to mid screen you should see the new easy access quick whatchamacallit
top right is where that's located.

I get all my help with my iphone here: