I am trying to convert this html menu to a nav in wordpress

   <nav id="nav-main">
                 <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">Graphic Design</a></li>
            <li><a href="#">Web Design</a></li>
            <li><a href="#">About</a></li>
            <li><a href="#">Contact</a></li>
                 </ul>
              </nav>

              <div id="nav-trigger">
<span>Menu <img src="img/menu_icon.png" width="40" height="40" alt=""/></span>

I would appreciate any help THANKS!