From the Dashboard, go to “Pages,” and click “Add New.” The title of this page will automatically be added to your top navigation bar.
Pages and Posts are different: new Posts automatically appear on your home page in reverse chronological order (unless you have a Sticky Post like this site does. That will always appear first). Pages will appear independently as another part of the website. Pages are good for content that does not change: a finished project you want to display, a writing sample, or your CV.