To do a new installation of the plugin, please follow these steps:
- Make sure you have a LightBox plugin enabled. Picasa LightBox doesn't work without a LightBox plugin. Grab one at http://zeo.unic.net.my/notes/lightbox2-for-wordpress/
- Download the zipped plugin file to your local machine
- Unzip the file
- Upload the 'picasa-lightbox' folder to the '/wp-content/plugins/' directory
- Activate the plugin through the 'Plugins' menu in WordPress
- Go to Options -> Picasa LightBox and set it up how you want it