How do idle fish talk privately?

Free fish can chat privately by clicking on the product page. Let me demonstrate the detailed operation steps below? (ゝω)

(Mobile phone model: Yijia 1 1, software and version number: Xianyu 7. 1 1.55.6)

1. Open the idle fish, find the idle items you want to buy and click Enter.

2. On the product introduction page, click "I want it" at the bottom.

3. Enter what you want to chat privately, and then click Send.