Automatic Update of Navigation Bars

I am attempting to modify a basic pre-designed web page to meet my specific
needs. I have chosen to include a vertical navigation bar and a horizontal
one at the bottom of the page. I have also chosen that the horizontal one is
updated automatically. However, I have found that this automatic update only
occurs when I chose one of the pre-defined default buttons provided by
Publisher, e.g. "Contact Us." If I creat a button with my own text on it the
automatic update for the horizontal navigation bar does not take place.
Additionally, I find that I cannot manually update that horizontal tool bar
to reflect the newly created butoons in the vertical navigation bar. Is
there some setting that I need to change that will allow me to get into the
contents of the horizontal navigation bar so that I can control its contents?
Thanks in advance.