If you mean to fill in the card expiration date, it will be displayed under the credit card 16-digit card number. For example, if the number below the card number is 02/ 10-02/ 15, it means that the card was issued in February 20 10 and will expire at the end of February 20 15; If the number below the card number only says 02/ 15, it means that it will expire at the end of February.