To activate your JCPenney Credit Card, you can either call the activation number provided or log in to Jcp.syf.com/activate, where you'll need to enter your 16-digit credit card number and security code. Refer to the sticker on your card for detailed activation instructions. Jcp.syf.com/activate is the website where JCPenney credit cardholders can activate their new or replacement credit card issued by Synchrony Bank. This secure online platform ensures your card is ready for use in-store or online at JCPenney and other locations where the card is accepted