There are two options:

1) After calling the credit card (printed on the back of the card), press 1 to enter the Chinese service, then press 4 to enter the cardholder service, then press 3-digit password setting, and then press 3-digit transaction password setting. After logging in according to the voice prompt, you can modify it yourself.

2) You can also log in to "Credit Card Online Banking" from the credit card official website (also printed on the back of the card), then enter "Account Management" in the upper left corner, then "Password Management" and click "Transaction Password Settings" to modify it yourself.