title: Customization of Navigation menu in Wordpress
body: <p>I'm new in Wordpress. I run the wordpress using xampp. Themes have a limited navigatiob menu, and I want to add two to four navigation menus with sub-menus in my theme. How can I do that? What file should I edit to add some navigation menus? </p>
  
  <p>Please help me.</p>
  
  <p>Thank you!</p>