Google Rich Snippets are pieces of information about your products that appear under the search results on Google's search engine results page. They can include ratings, number of reviews, prices, and other information. Since Junip is an official partner of Google Shopping, the review snippets will automatically display on your products after you install Junip's on-site snippets to your store theme to show reviews. There is no manual requirement from you here.
If you want to test that your snippets are displaying correctly, you can either search for your product on the search engine or head over to the Google Rich Result Test link and add the URL of one of your products.