How to turn off the rotation lock on my iphone 4?

I've just updated to iOS 7 and I can't find how to turn off the rotation lock!

Buy an android. Simple.

Scroll up from the bottom to access control center, then you'll see rotation lock

Swipe up on the home screen and its the right button on the top

Ok so drag the screen from the very bottom up there will be controls and rotate/rotate lock is one