In the above menu, go to "Learn" / "Chess Articles"
On that page on the right side near the top is a section entitles "Write an Article." Inside that section is a link, "submit an article." Click on it and create your article.
Or... just click here: Submit an Article
If one writes an article, where does one post it, or submit it to? I have seen numerous articles on Bobby Fischer's death, and am wondering how I would post an article.