Allow insert picasa album into posts and pages via short code.
Extract all files from the ZIP file, making sure to keep the file structure intact, and then upload it to
/wp-content/plugins/. This should result in multiple subfolders and files.
Then just visit your admin area and activate the plugin.
To configure this plugin, visit it's settings page. It can be found under the "Settings" tab in your admin area, titled "Picasa".
To make custom template for your gallery just copy
loop-picasa.php file into your template.