WordPress.org

1. Upload clickcha.php to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Go to Clickcha settings in the WordPress admin to set your API keys (you can get your free API keys on the same page)

Note 1: If you have WordPress 2.7 or above you can simply go to ‘Plugins’ > ‘Add New’ in the WordPress admin and search for “clickcha” and install it from there.

Note 2: If your WordPress theme doesn't have the comment_form hook (i.e. Clickcha won't show up with the comment form), enter the following code right before the closing </form> tag in the comments.php file of the theme.

<?php do_action('comment_form', $post->ID); ?>