WordPress.org

1. Unzip into your /wp-content/plugins/ directory. If you're uploading it make sure to upload the top-level folder. Don't just upload all the php files and put them in /wp-content/plugins/.
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Go to your Administration interface in the "Settings" menu a new "Category Meta" page is created. Configure the meta you want to use.
4. go to your Administration interface, in the "Category" menu -> new fields are displayed in the category creation/modification form with the meta you configured.
5. That's it!
6. you can use the folowing functions into your templates to retreive 1 meta:

if (function_exists('get_terms_meta'))
{
    $metaValue = get_terms_meta($category_id, $meta_key);
}

1. you can use the folowing functions into your templates to retreive all meta:

if (function_exists('get_all_terms_meta'))
{
    $metaList = get_all_terms_meta($category_id);
}