Missing field required updated & author

Hi there,

my website https://www.anettemossbacher.com shows 3 errors in structure data which I would love to fix.
The site runs a customized albedo theme from GPP. I found some codes in the internet for the Twenty eleven them, but not sure if they work for me too. I also would like to know in which folder and in which file php and in which row I have to add them!

I got this codes:
<span class=”post_date date updated”><?php the_time(‘j F,Y’); ?></span>
<span class=”vcard author”><span class=”fn”><?php the_author(); ?></span></span>

Missing required field “updated” & hCard “author”:
Contact page, About page and all Portfolios

Error: Missing required hCard “author”:
some single images.

Error: At least one field must be set for HatomFeed:
Homepage
and this kind of links: https://www.anettemossbacher.com/tag/svalbard/

Thanks so much

Ciao
Anette