You can show reviews that your readers have written on your site's landing page by logging in as an a library administrator.
Once you have logged in go to Setup > Site Options > Site Settings > Toggle on "Display Reviews On The Landing Page" (You should see a green check mark!)
Toggling this to on means that any events you have loaded in your site will show on your site's landing page.
Note that only reviews that have been approved will display on the landing page. This displays the book title, author name, review text, and reader's first name and last initial. You can approve reviews by following the steps in this article.