This can be anything, but obviously it should be your real name.
The topic text is usually used as the title and header for the new discussion thread's page. It should be meaningful, while short enough to avoid line-wrap if possible.
The large window of text will accept typed in text, and should "autowrap" when you get to the right margin of the window. This information is passed back to the browser as HTML.
You may find that you need to use the RELOAD button on your browser to see your new thread or a reply to an existing thread.
Abuse of this Forum will result in notification of the poster's internet service provider. School-aged children will use this forum so keep it clean. I will not hesitate to take appropriate legal action. Your ISP is logged when you post.