1. First, open the phone interface, and click Idle Fish to log in.

2. Click the publish icon at the bottom of the main interface to enter.

3. Then choose to worry about selling.

4. Then select more categories, and click on the top to sell books.

5. Then meet again and click on the book you want to buy, and the number will enter.

6. Meet again at last, and click Submit, so that you know how to sell books to idle fish.