Your WordPress menu (or navigation) should include links to key pages or posts on your website. From the WordPress Dashboard go to Appearance > Menus. From here you can create, edit and assign your menus.
Create a menu: Click the blue link to “create a new menu” and give the new menu a name.
Add/remove menu items: Use the options on the left side of the screen to add pages, posts, categories and tags that you’ve already published, or use the custom links option (which is great to link to other websites). To delete an item from your menu just click the “remove” link on the item.
Assign a menu location: After adding links to your menu use the Menu Settings section at the bottom of the page to select your menu location. These locations will depend on your WordPress theme and the locations (header, top bar, footer, etc) that the theme has defined.