Once you've installed the Iterate script on your website you can preview your survey by going to a URL that matches your targeting options and adding ?iterate_preview=true to the URL. e.g. https://yoursite.com/cart?iterate_preview=true
To ensure you can easily see a preview of your survey, all targeting options are ignored except the URL. As long as you visit a URL that matches what you've specified in the targeting section, you will see the survey.