Screenshots from your iPhone are great for sharing moments from your favorite videos, high scores from your games, conversations on social networks like Twitter or Facebook, bugs you want to report, and almost anything and everything you see on your screen. And even if the iPhone 6 and iPhone 6 Plus have moved the sleep/wake button to a new location, it's still as easy to take them as ever.
Depress the “Home” button and then the “Sleep/Wake” button. You will hear the camera shutter sound indicating that a screenshot is successfully taken.
Once successfully captured the image will be saved to your iPhone's Camera Roll. On your Camera roll check the screenshot you just took. Set it as wallpaper, share it or edit it as you please.
To locate your screenshot in your camera roll, tap to View, Favorite and then edit, send or share it. If you want to transfer the screenshot to your Mac, check this out.