We can receive messages from anyone that goes onto the site. But when you reply from the admin panel is does not send. Also above the plugin settings we have this error : Error connecting to server secure.wp-chat.com.
1)From your wordpress dashboard go to your “Chat” plugin –>Advanced settings–>and select Integration method: “external” and relogin into your chat dashboard.If this method did not work for you, then try ‘internal’.
2)Check if you use any security plugin on your WordPress, because it may block requests. If you use any, turn it off and try to use the plugin. Also, please, clarify if your hosting provider allows POST-requests from website secure.wp-chat.com