1) Download it on your computer, and unzip it
2) Upload it into your wp-content/plugins directory
3) Log into your WordPress blog, click on the ‘Plugins’ tab, and click ‘Activate’
And yes, the Plugin also supports Stats. If you want to get bookmarking statistics (e.g. top bookmarked posts over various time periods), open the .php file and set the ‘addthis_username’ variable to, well, your AddThis username.
We updated our plugin. You can download the new and improved version here: