1. Download the credit card APP on your mobile phone and click Open;

2. Enter the main page and click the "My" option;

3. Click Login;

4. Enter the account number and password, and click Login;

5. After logging in, click the "Settings" option in the upper right corner;

6. Enter the settings and click the "Password Management" option;

7. Enter password management, and click "Modify transaction password" option;