Take Bank of China Mobile Banking as an example. The specific steps are as follows:

1. First, we click Account Management on the main page of Bank of China Mobile Banking

2. On the account list page, we select the card for which we want to set a transaction password and click Enter

3. To enter the single credit card management interface, we click Card Management

4. Enter the card management interface , we select the transaction password setting at the top of the page

5. Enter the password you want to set twice in the password modification interface and click the confirmation button

6. Then we enter the bank and send it to Verification code of our mobile phone

7. After the verification is successful, the modification will be displayed