Open Settings > Motion.
Scroll down and find Hand Motion, then Palm Swipe to Capture, and tick the box.
Close the menu and find the screen you want to capture. Shape your hand like you are “chopping” the screen, set your hand vertically on either side of the screen, then horizontally swipe across it – it doesn’t matter which way – like your hand is a photo scanner. If you’ve done it correctly, you should hear the camera shutter and receive a notification that a picture has been saved to the gallery.
You speak the truth broski!