To activate your Cash App card, open the Cash App on your mobile device. Tap the Cash Card icon located at the bottom of the screen. Choose "Activate Cash Card" to begin the process. If you have the card, you can use your phone’s camera to scan the QR code on the card. Alternatively, if you don't have the QR code, select "Missing QR Code" and enter the CVV code and expiration date manually. Follow the prompts to complete the activation. Once done, your Cash App card will be ready for use for purchases and ATM withdrawals.