You can view and edit your payment method by logging in here: My Account.
- In the Update Payment Method section, you'll see your current payment method under, 'My Cards'
- Click the pencil icon to the right of the payment method (image below) that will make the payment method fields editable.
- You can enter a new expiration date, and will need to enter your CVV number (the 3 digits on the back) to confirm.
- Click the box to the left: Apply this payment method to all active subscriptions.
- Click the green Save Changes button at bottom.
If you need to enter a new payment method, those steps are here.