To unbind a bank card, first open the Shopee app, then click "More" on the "My" page, select "Wallet" to enter, then click "Bank Card" to enter the bank card management page, select the bank card to be unbound, and click the "Unbind" button, and follow the prompts to complete the unbinding operation. Note that before unbinding, you need to make sure there are no unfinished orders and balances, otherwise you need to process them first before you can unbind.