Hi, I could send any messages for my customer. I don’t know why. What can i do. I need your help
You have no sales so you have no customers. If you send unsolicited Etsy messages, Etsy will disable your message feature.
@theannart: If you mean that you are unable to answer customer messages through Etsy, you may have been "muted". Not to discount the fact that your messaging may have been disabled in error, generally it is because the system has detected that your account has been sending unsolicited non-transactional messages. While you are waiting for Etsy to reactivate your messaging you may want to read the "Dos and Don'ts of Communicating With Customers" https://www.etsy.com/seller-handbook/article/26590492608
Be prepared to wait for a month for your messaging privileges to be returned.