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Tap the Camera app icon, which resembles a black camera on a grey background. Your phone should focus in on the QR code after a brief moment. If your front-facing camera is on, first tap the camera-shaped icon in the bottom-right corner of the screen to flip the camera to the main camera. All four edges of the QR code should be on your iPhone's screen. Once the QR code is centered on your iPhone's screen, it should scan almost immediately. Tap the Safari notification that appears at the top of the screen to open the QR code's webpage or other information.
Open your iPhone's Camera. Point the camera at the QR code. Make sure the QR code is centered on your iPhone's screen. Wait for the code to scan. Open the QR code's content.