Hi @Melicious, I know the forum takes a bit to get used to. That’s an excellent question! The little gray button that says Reply directly under a post, will reply to a person. If you scroll down a little more, you’ll see a green button that says Reply. That reply button will be directed to the thread in general.
If you look for the Forum category, subcategory: How to use this forum, you’ll find tutorials. There is one on posting here.
Forum Help - Posting a New Topic, or Posting to an existing Topic
Hope this helps 