First, sign in to Slate at slate.com/login. Then go to your account settings page. You can get there by selecting Account from the top right corner
Then click Subscription & Payment..
To update the expiration date, postal code, or security code on an existing card number, select Edit.
To change your card to a new number click Add card. To switch to PayPal, click Add PayPal.
To change your card to a new number click Add card. To switch to PayPal, click Add PayPal.
