Yes you can change your card to a different credit card. You will not be able to change your card to a debit card unless your plan was initially created with one.
Just log in to the shopper portal here and click on 'update card'. You can only update your card 2 times in any 24 hour period.
To log in, just go to our shopper portal and request a secure, single use link (magic link) which will be sent to the email address registered to your account. Alternatively you will be able to log in using your Google or Facebook account if you prefer.
No need to remember any additional passwords.
Each magic link lasts for 15 minutes and it can be used only once so you will need to generate a new one each time you log in.