Ways to use the new back button in iOS 9

Many may have find this very difficult but we here to make it easy with this easy steps from AppleInsider.
One of the most notable — albeit least trumpeted — user-facing enhancements in iOS 9 is the new back button, which lets you quickly return to where you were when following links between apps. Here's how it works.

iOS's ability to automatically steer you into the proper app for the content you want is usually immensely useful, but it can be a drag. While you probably do want to watch a YouTube video in the YouTube app, being booted from Safari to Facebook after you accidentally tap the Facebook login button is...annoying.

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As a result, many iOS users have burned the double-tap-swipe-left-tap-again gesture into muscle memory.

In iOS 9, that's no longer necessary. When you tap on a button or link in an app or notification that directs you to another app, iOS 9 will replace the signal meters in the upper left with a back button — just tap it go back to where you were.

The back button will stay in place until you switch away from the new app, but it won't go more than one level deep. If you follow a link from Messages to Safari, then from Safari to the App Store, you can't use the chain of breadcrumbs to go back to Messages — it'll only take you back to Safari.