The way plugin works is that it has a concept of having auction feed which is a collection of auctions. Person would then click interested auctions.
Plugin has only 1 shortcode.
In-case you want to showcase only single auction, you can add this shortcode and add your single auction. then grab the auction url from address bar and showcase that link anywhere on your site. You dont have to show feed page (with shortcode) anywhere on your site.
Regarding disabling comment field, you can easily do it:
1. Unzip plugin file. Find "auction-description-tabs.php" file
2. Comment 4th line.
Hope it helps