Preparation tool for modifying China Merchants Bank credit card password: an internet-connected computer.

1. Use Baidu to search for "China Merchants Bank Credit Card" on your computer, and open the official website of China Merchants Bank Credit Card in the search results.

2. Find and click the "Online Banking Login" button on the right side of the homepage of the official credit card website.

3. On the newly opened login page, enter the corresponding information and click the "Login" button.

4. After logging in, you will see the credit card management page. On this page, click "Card Management" > "Transaction Password Management" > "Transaction Password Settings".

5. Click the "Change Password" option in the opened transaction password management page.

6. Enter the old password and new transaction password in the newly opened password change page and confirm to complete the password change.