1. Open the sign-in mobile phone application of entrepreneurship training class and find the sign-in record that has been punched in.

2. Click on the sign-in record to enter the record details page.

3. On the record details page, you can see the check-in and check-out options.

4. Click the checkout option to enter the checkout page.

5. On the check-out page, enter the check-out reason and time, and confirm that the information is correct.

6. Click the "Submit" button to complete the signing operation.