The steps for handling the crude oil extension transaction in the account through ICBC's personal mobile banking are as follows:

1. Open ICBC Mobile Banking, and click on the upper right corner to log in to Mobile Banking.

2. Enter the bank card number or mobile phone number and password to log in to mobile banking.

3. After logging in, click to enter the main menu.

4. Click on the commodity account in common functions.

5. Check the crude oil.

6. Click on the account crude oil extension in the list on the right to trade the account crude oil extension.