How to change the apple id on my ipohne?

I recently bought an iphone from someone and I can't get anything off the app store because it still has there apple log in information.

1)Open up the app store.
2)Go to featured in the toolbar in the bottom left hand corner of the screen.
3)After waiting for the page to load, scroll down until you see "Apple ID" and the name of the apple ID.
4)Tap the button that says the ID, and click "Sign out." It will then sign out.
5)Repeat the process, up until step 4. Instead of doing what step 4 says and signing out, press "Sign in."
6)Type in your Apple ID.

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