In the message tag field, you have to select a message tag. Click on the message tag field and instantly will appear a drop-down menu of different message tags such as Human agent, Account update, Confirmed Event, Post purchase Update, Non-promotional(NP registered only).
If you select the human agent message tag, you have to reply to the message from users within 24 hours, otherwise, you will get an error. In this case, you have to use other message tags. If you want to know the usage of message tags, read the article by Facebook for developers.
Moreover, you can also search messages on the search bar in the messaging window.
Also, you can select a time for automatic reloading by clicking on the reload button.
Click on the reload button, and a dropdown menu of different times will appear. Now just select a time. After that, the live chat will reload automatically between the time you have selected.
