Header Menu – JQuery Plugin – Dropdown Issue

Hello:

I am using a theme that does not have dropdown menus available. So, I installed a JQuery menu plugin, but I cannot figure out how to make submenus.

This is the plugin:
http://ww.wp.xz.cn/extend/plugins/jquery-drop-down-menu-plugin/

I do not understand how to customize my menu.

Here is my site:
http://s411164968.onlinehome.us/

Does anyone know how to do this?

Thank you.