IPhone isn't letting me go on Usage?

I really want my battery percentage to show at the top of my iPhone, and you change that by going into Settings > General > Usage > Battery Percentage but every time I press Usage it just pauses for a moment then kicks me back to the home screen. I haven't messed around with any settings so I honestly don't know what's going on.

First make sure you try to close any other running apps by double tapping your home button and then swiping up on the apps for IOS 7. If you have 6 then just tap the X button next to all the applications. If this problem still continues, try rebooting your IPhone. Simply hold the power button and the home button for about 10 seconds to force shut it off.

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