Select the topic you want to reply to.
This topic can be a main topic or another, existing reply to a main topic.
Click New and then click Reply.
A Reply form displays containing a fixed header with the title of the parent topic.
Fill out the rest of the form just as you would for a main topic, and click Save.
In the view, the title for the Reply topic uses approximately the first 75 characters of the topic's body text.