Hi there,
To change your card on Epoch, please send an email to their billing representative at billing@epoch.com with your Epoch Member ID and card details. You will find the member ID on the email you received from Epoch confirming your payment.
There's more information here:
https://epoch.com/billing_support/find_purchase
If you need more help, please send us a message directly through the Spandex Party message window (the question mark symbol in the bottom left-hand side of your screen).
Enjoy the site!