You can change your payment card by logging into your account, and then going to the Payment Method tab here.
Please note, if you remove your card information from your account but wish to book a new session, you will have to enter valid card details before you can book an appointment with your chosen therapist. Your therapist will also only be able to book follow-up sessions for you if you have a payment card attached to your account.
We have information about our payment system and the security of this here.