From the left Menu bar, click on the Menu from Appearance dropdown
You can add the built-in pages, posts, product category etc in your menu.
If you don't have a Menu already, click on the create new menu
If you already have page and you want to add it into your website, you can simple tick the page and click on the add to menu.
You can also insert your custom links or URL in menu from Custom links options
Now you have created your first Menu. To insert the Menu into your website, follow these steps:-