New in iOS 9 is the ability to search for settings. On the Settings app, slide down on the main screen to reveal the search box. Type your search text to display the search result. Tap on the listing to go directly to the particular settings screen. The search includes third party apps that store their preferences in the Settings app.
This is a feature that should have been in iOS since the beginning. It is a pain to remember or poke around where a particular preference is located in the Settings app. Finally there is no more time wasted fishing around aimlessly for a setting location.