To add a page to the menu, go to the Structure > Menu control panel and simply drag it from the page list on the left to the desired position in menu list on the right.
Sometimes, however, you want to add a link to an external page directly from the menu. To do this, add an External Reference by clicking the button of that name at the top of the page index.
Enter the label text and the URL to which you want to link. Note that the link must include "http://" if it is an external link.
You can also use this facility for internal references, typically for direct access to a PDF or image file. In this case, include only the path and filename for the file to which you want to link (such as "/annualreport.pdf").