Error: Missing required field "updated

hi i am using frontier theme . i am trying to get authorship verification by google and is having this error

Error: Missing required field “updated”.
Error: Missing required hCard “author

i dont know how to solve this issue. i searched the web and found that i have to change the single page php. and change the php like this
Fix Missing required field “updated”
look for the code below on your WordPress theme’s single.php file.

001
<span class=”post_date”><?php the_time(‘j F,Y’); ?></span>
then add “date updated” attribute to it. Your code should look like

001
<span class=”post_date date updated”><?php the_time(‘j F,Y’); ?></span>
Fix Warning: Missing required hCard “author” and Missing required field “name (fn)”
This will fix these 2 warnings. On your WordPress theme’s single.php file, look for

001
<span class=”theauthor”><?php the_author_posts_link(); ?></span>
or

001
<span class=”theauthor”><?php the_author(); ?></span>
replace it with

001
<span class=”vcard author”>
002
<span class=”fn”><?php the_author_posts_link(); ?></span>
003
</span>
or

001
<span class=”vcard author”>
002
<span class=”fn”><?php the_author(); ?></span>
003
</span>
i searched my theme php but dont find these lines . any one can help