1. You need to find Na Ying's official account on the social media platform and find her post or content.

2. After finding the post, you can click on the comment area below the post to enter the comment area interface.

3. In the comment area, you can find a text box or an input field where you can write a message. Enter what you want to leave a message in the text box.

4. After entering the message, there are buttons to send, comment or the like. Click this button to post the message to the comment area.