Using the Wordpress plugin
Search for "bamazoo" from the Plugins section of your Wordpress admin. This will bring up the official bamazoo plugin.
After clicking "Install Now", the plugin will download and install. Once complete, simply click the "Activate" button.
You should now see the activated plugin. That completes the plugin installation.
Copy the WordPress dgs shortcode from your bamazoo account for the product you'd like to show on your site.
Paste the dgs shortcode into your WordPress post or page and publish/update it.
Check your site, you should now see the buy now or add to cart button rendered on the page.