You can temporarily lock your card to prevent it from being used. This can be done at any time in your account either on a web browser or on the mobile app. On a web browser: Log in and select Checking. Look towards the right and you’ll see the option to easily lock or unlock your debit card. On the mobile app: Log in and select Checking. Click on Manage Account and you’ll see the option to easily lock or unlock your debit card. If you can’t access a web browser or your mobile app and you need ...