you can get a link to the page in the php code using the function "zen_href_link," this is the standard function for getting links in zencart. If you called your page "my page" then in the php
PHP Code:
$link_to_my_page = zen_href_link( FILENAME_MY_PAGE, '' ); 
will give you the link you need and if you want to use this then you need to stick it in a link:
PHP Code:
echo '<a href="' . $link_to_my_page . '">Link Text</a>'; 
This will print a link to your page where you put it in the code. To put a link to this page in the navigation bar you will need to find the file that generates the navigation bar and then modify it to your needs.

I'm afraid that as I said in the introduction, this is a meta-mod, so it is something that helps you generate new code for your site. Unfortunately if you want to use this code then you need to do some (basic) programming.