This widget only appears on the homepage (both desktop and mobile). Usually, you don’t need to reconfigure it—it’s added automatically (make sure you have posts for it to appear). If you don’t want to use it, simply delete the widget from your layout in the admin area.
To install the Recent Posts widget like in the demo, add an HTML/JavaScript gadget under the Recent Posts section (Blog Dashboard > Layout > find the 'Recent Posts' section). Edit the HTML and paste the following code:
<script type="text/javascript"> var posts_no = 4; var showpoststhumbs = true; var readmorelink = false; var showcommentslink = false; var posts_date = true; var post_summary = false; var summary_chars = 70; </script> <script src="/feeds/posts/default?orderby=published&alt=json-in-script&callback=showlatestpostswiththumbs"></script>