Thank you for your feedback! Sorry I am new to hacker news and I didn't know about that feature!
It's less of a feature and more of a convention. Just put "Show HN:" in front of the title if you're showing your work, or "Ask HN:" if you're asking a question without linking to an existing article. For "Show HN", it's customary to only submit each project once.
There is also "Tell HN:" but afaik it's mostly used by the mods, dang and sctb, to announce rule changes or new features.
Edit: BTW, this shuld probably be a "Show HN:" post.