This plugun doesn't work

This plugin will only add rel=”lightbox” to images from your media library. If you add it manually, it will not change those links.

If you have added rel=”lightbox” to an image link, but there’s no popup when you click it, do you have a lightbox/slimbox plugin installed on your site? This plugin only automates adding the effect, but doesn’t add the lightbox javascript — you’ll need to do that separately.