Easy Contact is a simple, highly extensible XHTML contact form featuring spam-reduction measures, GUI customization, and shortcode-based insertion.
This plugin is installed just like any other WordPress plugin. More detailed installation instructions are available on the WordPress Codex.
/easy-contact/folder from the archive
[easy-contact]on any page/post
In other words, just upload the
/easy-contact/ folder and its contents to your plugins folder.