Not sure who you're trying to contact, but you don't need to contact anyone to add navigation to your site.
Just create a page called Table of Contents, then add links to all your currently-posted chapters. Get in the habit of updating your TOC whenever you do another post.
You're also going to want to put "Next Chapter" and "Previous Chapter" links at the bottom of your page. Just write those words at the end of your post and link to the previous and next chapters. The formatting's going to be a little wonky. I personally just write the next and previous chapter links on separate lines. I left justify the "Previous Chapter" link, right justify the "Next Chapter" link.
(Not sure but I think I've seen Wordpressers put next and previous chapter links on same line, but they're justified on opposite ends of the page? That looks nice. If anyone here knows how to do that, please let me know!)
It's a little clunky, but unfortunately there's no better way to do it on Wordpress (unless things have changed recently, in which case someone shuld feel free to chime in).