The short answer is: Press the Home and Lock buttons on the phone at the same time to capture a screenshot. For a more in-depth explanation as well as alternative methods, read on.
Apple has never made taking a screenshot a tough task. Doing so allows you to capture an enlarged version of what’s displayed on your smartphone as a PNG file, allowing you to quickly share the image among friends via email, text, or through popular social networks such as Facebook and Twitter. Hell, you can even send the screenshot to tech support for further analysis, or use them to make a how-to guide or brag about your Pokemon Go level.
Taking screenshots with physical buttons
Step 1: Locate the necessary buttons — You’ll want to locate the Home button and the Lock button on your iPhone. Chances are, you probably know where these are, because they’re literally the only physical buttons on the phone. If not, don’t sweat it. The Home button is circular and appears on the face of the phone, directly below the screen. The Home button has occupied the same real estate on every model of iPhone. The Lock button — also known as the Sleep/Wake button — is located on the right-hand side of your phone, at least if you’re using an iPhone 6 or newer. Otherwise, it’s located on the top of your device.
Step 2: Capture the screenshot — Press and hold the Home button once the image you’d like to capture is displayed on your screen, immediately followed by the Sleep button. The iPhone display will then briefly flash white, signaling that the screen capture worked correctly. You’ll also hear a faint shutter noise, so long as your device isn’t in silent mode.
Step 3: View and share the screenshots — Once captured, your iPhone will automatically save the screen capture directly within the camera roll (aka the Photos app). Simply tap the Photos app, which is represented by a multi-colored sunflower icon of sorts, and scroll to the bottom of the photo stream to view the recently-captured screenshots. Then, tap the thumbnail to enlarge said images, or the box in the lower-left corner while viewing the image to access options for sharing the screenshot via text, email, AirDrop, Facebook, Twitter, and other services.