At any point, you can preview the icons that are included in any given icon set. You can do so from the Icon Sets page. First head to the Icon Sets page from the WordPress dashboard. You can get there by navigating to WPIcons ⇨ Icon Sets. When on the Icon Sets page, you should see all of your installed icon sets listed.
Preview an Icon Sets Icons
Hover over the icon set you would like to preview to reveal the action links. Find the first link in and click the Preview icon.