To delete the card from your digital wallet click here for instructions to delete it from your Apple Wallet and here to delete it from your Google Wallet.
If you’d like to set up a new card you may do so by following the same set up steps from within the Afterpay app. It will again be attached to your existing Afterpay account. You can also set up multiple Afterpay cards associated with your Afterpay account if you use multiple devices.