A Wordpress plugin is for those who already operate a WordPress website. To get the monetizing plugin that enables your site to earn Bitcoin just register as a BungeeBones user. When you login it will ask you to add your link information (you are enabling Bungeebones to advertise your website across the network). After you add your link return to your BungeeBones User Control Panel and see the button to the right of your link labelled "Earn Income". That will offer you the option to download both the WordPress plugin and the PHP script (if you operate a non-Wordpress site).