1. Contact Teacher Yang or related institutions: You can try to express your refund request through social media, course website or directly contact Teacher Yang or related institutions. When contacting, explain the situation and the reasons for asking for a refund.

2. Submit a refund application: If Mr. Yang or relevant institutions agree to refund, submit a refund application. Refund applications usually need to include information such as name, contact information, order number and refund amount.

3. Waiting for processing: Once the refund application is submitted, it needs to wait for teacher Yang or relevant institutions to review and process it. The refund will be returned to the original payment account within a few working days.