To reply to a topic, display the topic then click the Reply button.

After clicking this button, you can enter the body of your reply. You can use the content editor to format the text and add pictures, document, or links. Once you are done composing your reply, click Post.

To comment on a particular reply within a topic, click the Quote link above the reply. This will include in your message the text of the reply that you are commenting on. Once you are done composing your comment, click Post.