From the WordPress admin dashboard, navigate to the Appearance tab in the left sidebar, and select Menus from the sub-menu.
At the top of the screen, select a menu from the dropdown to edit.
From the left side of the screen, you can select from Pages, Posts, Product Categories, and many other internal links from your site to add to the menu. To add one, simply check the box next to it and click Add to Menu.
You may also add a custom link to an external source.
To edit an existing menu item, click the arrow on one of the items to edit the navigation label or to remove it from the menu.
To reorder the menu items, simply drag and drop them to your desired order. Drag any menu item to an indented position under another item to create a dropdown menu.
When you have finished working, click the Save Menu button on the bottom right of the screen.
