To read a thread, click on its title. Each post in a thread is created by a member or a guest. You'll see some brief information about the member who created the thread above the main post message. In some cases it will be to the side of the post. To post a reply to an existing thread, click on the Reply link at the lower right of the post you are reading. There is also a Quote link that will allow you to quote what the original poster had written in your new post. You select what you want to quote in the original post by clicking and high-lighting what you what to use as the quote. Once high-lighted, a little box will open offering the option to Reply. If you select Reply, a new post box will appear with the selected quote.