WordPress.org

This plugin is installed just like any other WordPress plugin. More detailed installation instructions are available on the WordPress Codex.

1. Download Easy Contact
2. Extract the /easy-contact/ folder from the archive
3. Upload this folder to ../wp-contents/plugins/
4. Activate the plugin in Dashboard > Plugins
5. Customize from the Settings > Contact options menu
6. Use the shortcode [easy-contact] on any page/post
7. Enjoy. And then consider donating

In other words, just upload the /easy-contact/ folder and its contents to your plugins folder.