Add a message to a thread
In the list of tools for managing discussion threads, locate the Reply to this thread icon . This allows you to add a message at the same hierarchical level as the starting message.
clicking the icon will give you access to the on-line editor to write your message. An area allowing you to read the other messages of the thread appear at the bottom of the page,
give a short topic to your message,
enter your message,
choose whether you want to be notified by e-mail in case anybody answers your message,
attach a document (optional) and, if you do, add a small comment describing the document,
click on the Reply to this thread button.