WordPress.org

1. To install the plugin, you must first copy the directory yacaptcha in your WordPress plugin directory which must be /wp-content/plugins/. If you are using Wordpress 2.7 or higher, you can simply use the plugin installer in your site admin section, search for yaCAPTCHA and click on install or upload the zip file.
2. After the installation, you need to go in your site admin, in the Plugins section and activate the yaCAPTCHA plugin.

It should works flawlessly with the default theme.

Optional intallation steps

• For WordPress version lower than 3.0, the default theme and most themes place the additionnal comment form items after the submit button. I suggest you change it so that it appears before the submit button. Have a look at the "How can I customize it?" section in the FAQ. This is not necessary if you are using version 3.0 or a higher version of WordPress.
• The default WordPress settings regarding comment appearance should be tweaked with this plugin. I suggest you uncheck these two options: "An administrator must always approve the comment" and "Comment author must have a previously approved comment" in the Discussion Settings, "Before a comment appears" area.