WooCommerce is the most popular WordPress eCommerce plugin. And it’s available for free. Packed full of features, perfectly integrated into your self-hosted WordPress website.
How to Install the Plugin
To add the plugin to your WP Site. please go to Plugins in your WP-Admin menu, click on Add New, Search for “woocommerce”.
you’ll get a list of plugins, woocommerce should be on top of the list ( if you get confused, make sure that the plugin author are the great people at WooThemes), click on Install Now, now WP will download and install woocommerce, and once it’s done click on Activate Plugin and you’re all set with woocommerce for your WP site.