How to chance my passcode on my iphone?

I've already done this multiple times before. I change my passcode every so often because I don't like people being on my phone. But today I wanted to change my passcode so I went to settings then general, and I couldn't find the setting were you change the passcode. There's usually "auto lock" then under it "passcode lock" then under that "restrictions", but my phone does not have "passcode lock" for some reason and I don't know why. I have an iPhone 4s just so you know and I just updated it to iOS 7.1 yesterday.

Settings>General>Passcode Lock>Type in current passcode>Change Passcode>Enter new passcode.

The Passcode Lock setting can now be found on the main Settings Screen. Go to the main settings screen, and then you should see general, wallpapers & brightness, sounds, and under sounds, there's Passcode.

Do you mean,"How do I change my passcode on my iPhone?"