To embed a campaign badge on your webpage, click the "<> Embed" link on your campaign page. You can find this at the bottom of the box that contains your campaign photo or video.
This will give you three different badge options. Just copy the code next to whichever badge you want to place on your webpage, then paste the code at your site.
Please note that if you are using a free Wordpress blog (for example, yourname.wordress.com), the first badge, which has a code beginning with "iframe," will not work. If you are using a custom Wordpress installation (or any other website/page editor system), you should be fine.