Just upload this plugin to WordPress and activate it. The plugin will add social sharing buttons under post content.
You can enable each social network and change settings via Settings → Seed Social.
Official development of Seed Social is on GitHub, with official stable releases published on WordPress.org. The GitHub repo can be found at https://github.com/SeedThemes/seed-social. Please use the Support tab for potential bugs, issues, or enhancement ideas.
This plugin is available for download for your site.