In order to update your payment details, first, you need to have an Administration level or access.
Go to the Main Menu - Settings - Account.
Next, scroll down to see your Subscription details.
To manage your add-ons - click the Green Square 'Manage Add-Ons'.
To change your Subscription Plan, - click on the 'Change Subscription Plan' button.
To update your credit card details - click on the 'Update Credit Card' button.
To cancel your subscription, click the 'Cancel Subscription' button.