You could edit the title to start with 'Show HN:' instead of 'Launch:' so it shows up in the feedbacky places of the site, more info here https://news.ycombinator.com/showhn.html
You could have edited the title a bit after you posted but I think you're past the edit window now. You can just email hn@ycombinator.com with a link to your current post and they'll sort it out for you.