How to lock apps like Instagram?

My friends keep using my iphone 5c on the bus and putting embarrassing stuff on Instagram or texting people I love u how can I lock apps to make them have to use a password to do that

I don't know put a password on your phone tht no one KNO! N i don't know I will figtre out how to do tht tho.maybe!;)

Well then don't let them use it. Jeezus its common sense.

There's various of apps available in the App Store that can put apps on a secret folder or put a lock on the app, from free to paid apps have a look at what you can see. My recondition would be the app called "secret app lite" I use this and I love it.

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