It sounds like you’re looking for the sorbet_posted_on function, which is in the file /inc/template-tags.php.
To replace that function with your own, don’t edit the theme files directly, or your changes will be overwritten when you update the theme. If you’re new to child themes, you can explore these guides:
https://codex.www.ads-software.com/Child_Themes
https://op111.net/53/
https://vimeo.com/49770088
When your child theme folder is set up, create a blank plain-text file called functions.php and place it in your child theme. Copy the sorbet_posted_on function from the parent theme’s functions.php file into the new functions.php file in your child theme, starting at line 128:
if ( ! function_exists( 'sorbet_posted_on' ) ) :
through to the last line, 154:
endif;
You can add your new content after this function, which displays the author:
get_the_author()
