1. First, open the official website of Cai Yi Education and log in the account. Click the "My" button in the upper right corner of the page to enter the personal center.

2. Secondly, on the personal center page, click "course center" to enter the list of purchased courses. In the course list, select the course you want to activate, find the "Activation Code" button and click it.

3. Finally, in the pop-up window, enter the activation code and click the "Confirm" button to complete the activation of the course.