Upload the folder to the /wp-content/plugins/ directory.
You will need to find some social icons. For example, Paul Robert Lloyd's social media icons. Upload the 24px (or higher, but the page will load slower) version of the icons anywhere you want, however you must have a full URL to the image. For page speed reasons, I recommend you upload them either on a CDN or on your own site though. You can have 6 icons.
Activate the plugin through the 'Plugins' menu in WordPress.
Go to the settings pane and fill in the complete URLs of the images.
The plugin should now work and display at the top left of your site.
Requires: 1.5 or higher Compatible up to: 3.2.1 Last Updated: 2011-8-31 Downloads: 1,718