hi jackie7,
We will update it on upcoming version. So for now you can currently make a direct changes in the theme folder
Go to theme folder -> library -> structure -> content-extension.php on line no 150, 323, 482, 597, 714 you will find
<span class="by-author">
and replace it with <div class="by-author vcard author">
Similarly on line no 151, 324, 483, 598, 715 you will find <span class="date">
and replace it with <span class="date updated">
Thank you