To Activate Cash Card using the QR code: Tap the Cash Card tab on the cash app home screen. Touch the picture of your cash card. Tap Activate cash card. Tap Accept when your Cash app asks for permission to use your camera. Scan the QR code. These are some the steps followed up for activating your cash card using the QR code. https://www.apple-supportphonenumber.com/blog/activate-cash-app-card