Look at the right above your post. Do you see the #1? Well, if I click on it it'll open a page with just that post.
Now say I do this: [*URL="http://www.serebiiforums.com/showpost.php?p=2856680&postcount=1"]help needed[*/URL] (take out the *s)
It turns into:
help needed
So for the chapters you could do the same thing but replace the "help needed" part with the chapter title and the url with the chapter url.