First, open the software on the mobile phone and enter the main interface of the software. We find my option in the lower right corner of the interface, and click this option to enter my page. In my page, we find the word book option at the top left of the page, and click this option to enter the word book page. After entering the word book page, we find the word book to start learning again and click it, and then we can see the option of canceling collection at the top right of the page, and click this option. Then we enter the library page, find the word book that has just been cancelled in the library page, and click the word book to enter the word book page again.