At the end of any message, you will receive a prompt ending with !. At this point, you may reply to the message if you wish. If you would like to do this, type reply and press <ENTER>. CompuServe will present you with this prompt;
Enter reply. (/EXIT when done)
Type in your reply. Keep each line less than 80 characters long, and press <ENTER> after each line. To end your reply, type /post as the first entry on its own line and then press <ENTER>. CompuServe will respond with a message like this:
Message # 18127 posted
Your reply has been sent.