To change your credit card, log in to the dashboard, then go to the "Settings" page, then click the "Subscription & Billing" on the top and then click "Change Credit Card or Paypal".
You will need to be the administrator, or the person who originally set up the account. Invited users ('collaborators') can't see any billing information, or update it.
It's as easy as that! You'll be redirected to a separate secure page to update the card.
If you don't have access to the administrator account but need to change the card in a hurry, just let us know here and we'll be happy to send you a link.