Download the plugin.
Install plugin in Wordpress from Plugins => AddNew => Upload Plugin => submit and then activate.
This plugin requires WooCommerce to activate.
Once activated, you can see the Icecat tab in WooCommerce settings.
Username is a required field, please fill it.
You can select the settings to show the widgets where you want to place the Product Catalogs or you can add the shortcode too.
For products, you need to place the shortcode [icecat_product] and if you want to use the shortcode in other post types or pages you need to pass the product id in the shortcode [icecat_product id="place product id"].
Once you add/edit a product please update the MFG Number & Brand Name under the Icecat Integration.
Save the product & go to the front end.