When I receive a message, I do not have the "reply" option on the right side of the dialog box. Why not? Please assist.
This application hasn't been updated in a long time. I've checked the official website and there were no news or release notes updated. The error you encountered might be caused by a bug in the application's code.
Try downloading the latest version and then try again: http://borgchat.10n.ro/download.php
Secondly, use other chat applications since this one is very old: http://software.informer.com/search/lan+chat