Changing your payment method can be done in a few easy steps on your MYX Touchscreen (note: this can only be done on the MYX tablet)
Please select "Settings" in your profile by clicking your profile icon on the top left corner.
Under your profile find "Account" and click on it.
From there, you'll be able to change your card under the "Payment Method" section., tap "Account" on your main app menu and update your credit card information on the screen.
Alternatively, you can contact customer support to speak with someone on the phone. However it is much faster to change it within your app.