How to activate cash app card with QR code? how to activate cash app card? Open your Cash app on your device and then find and click on “Cash app card” and after that you will need to choose your Cash app card image. After this click on “activate” and then the Cash app will ask you to scan your QR code. After this your Cash app card will be activated. In case, your Cash app card is not activated yet then, you can contact the Cash app support team by clicking on the link mentioned here.