WordPress.org

1. Upload the installation zip file to the /wp-content/plugins/ directory
2. Unzip the file
3. Activate the plugin through the 'Plugins' menu in WordPress
4. Obtain your API Key on Tractis
5. Configure your plugin through 'Tractis Certified Profiles' in the 'Settigns' menu in WordPress: paste your API Key and choose the button for your blog.
6. Place <?php widget_TractisAuth(); ?>

If your theme supports widgets you can enable the Tractis Certified Profiles widget to show the button.