You can change your credit card information through Dell Digital Locker (DDL). Follow these steps:
Figure 1: Dell Digital Locker Sign-in
Figure 2: Dell Digital Locker - Billing Accounts
Figure 3: Dell Digital Locker - Manage Subscription
Figure 4: Dell Digital Locker - Manage Billing Information
Figure 5: Dell Digital Locker - Save Changes
Figure 6: Dell Digital Locker Sign-in
Figure 7: Dell Digital Locker Sign-in window
Figure 8: Forgot Your Password screen
Figure 9: Activate the license
Figure 10: Download your office apps