How to lock and unlock iPhone screen with iOS 7 update?

How can you lock or unlock your screen so it rotates? You used to double tap the home button and the bar would pop up, now it doesn't. Where or how can I find it?

Slide from bottom to up and menu will open with different quick settings

Slide from the bottom of the screen to the top. It shows the control centre. The top right one is the lock/unlock button

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