Pages and Posts are different. If you go to your Dashboard, you’ll see a large New Post button on the right, so you click that to add new posts. To add new Pages, scroll down the dashboard and on the left is a Pages icon, click there.
Pages are made to show static information such as an About page or contact information. Posts are shown on dynamically generated pages such as the home page, categories or archives pages. You can create a custom menu that contains links to individual posts or category pages that show all the posts in a certain category. You can find more information about custom menus here: