1. On the mobile phone desktop, open the China Bank app.

2. After opening the China Bank app, click the place indicated by the arrow in the upper left corner of the page.

3. Next, click Login.

4. After logging in, click the credit card indicated by the arrow.

5. After entering the credit card interface, click the line indicated by the arrow to adjust.

6. On the following page, adjust the transaction amount and click Save.