Before you can use the plugin, first you will need to create the navigation menu that you want to display. Go to 外观 » 菜单 to create it. See our beginner’s guide on 如何在WordPress中添加导航菜单 for detailed instructions.
However, if you are not familiar with CSS, then you can try CSS 英雄. It is a powerful plugin that allows you to style anything on your WordPress site using a simple user interface and without writing any code.