Upload the entire 'addmarx' folder to the /wp-content/plugins/ directory (this is the path necessary for customization to function properly)
Go to the Plugins page in your WordPress Admin area and click 'Activate' for Addmarx
(Optional) To customize the placement, button or link choice, and colors of the Addmarx WordPress plugin, go to the Plugins page in your Wordpress Admin area and click 'Customization Options' in the Addmarx description. For some customization options, you will be taken to addmarx.com, where you can follow a few other simple instructions.