如何配置自定义Nav Walker子菜单？

Question

我需要http://www.sheabutterrecipes.com/BNS/index.html在wordpress中键入主菜单。 我的HTML是

 <div class="collapse navbar-collapse bg-green geernnav-bar" id="navbar-menu">
                    <ul class="nav navbar-nav navbar-right">
                        <li class="menu-item dropdown"><a href="#features" class="dropdown-toggle" data-toggle="dropdown">shop<br>baraka</a>
                        <ul class="dropdown-menu">
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">certified organic & fair trade</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">certified fair trade</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">shea butter bags</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">buy now</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">shipping & logistics</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">returns policy</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">your privacy</a></li>
                        </ul>
                        </li>                   


                        <li class="menu-item dropdown"><a href="#features" class="dropdown-toggle" data-toggle="dropdown">women & <br> community</a>
                        <ul class="dropdown-menu">
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">community certified fair trade</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">environment & development</a></li>
                        <li class="menu-item dropdown dropdown-submenu"><a href="#home">ustainable development goals</a></li>

                        </ul>
                        </li>
                        <li><a href="#test">private label &<br>industrial sales</a></li>

                    </ul>
                </div><!-- /.navbar-collapse -->

在我的header.php上有

 <div class="collapse navbar-collapse bg-green geernnav-bar" id="navbar-menu">
                <?php
                    wp_nav_menu( array(
                        'menu'              => 'Menu 1', // match name to yours
                        'theme_location'    => 'header',
                        'container'         => 'navbar-menu',
                        'container_class'   => 'collapse navbar-collapse bg-green geernnav-bar',
                        'menu_class'        => 'nav navbar-nav navbar-right'


                    ) );
                ?>

                </div><!-- /.navbar-collapse -->

现在我该怎么办？我无法自动配置下拉菜单。请帮我。我是新手，不是专家。