For all Pages except the home page you find a directory and a .inc file. Within the directory, there is an index.html.tmpl file. For example: about.inc, about/index.html.tmpl. I did it that way, that I copied those files to a new name. Then I opened the new index.html.tmpl file and replaced about.inc by the name of the new .inc file and "about" in the 3rd line of the file by the name of the new page. The .inc file contains the content you want to show on the page.
So, how to include the new page into the menue?
- Open skin.conf and look for "nav_*" items. Add your item.
- Look for "*_page_header" and add your item, too. Save the file.
- Open page-header.inc and look for "*_page_header". Add 2 lines like the other examples there for your page. Save the file.
- Open header.html.tmpl and look for "nav_*". Add a line for the new page in menue like the examples there
- Remove lines you do not want any more. Save the file.