Hi @balazinska
it’s not good idea to place privacy policy in the footer, because there is infinite article loading on scroll… So if you’ll have many articles user may never be able to see the footer on pages like blog or category. Better idea is to add privacy policy link in mobile menu (Left Menu).
However if you really need it – you should use child theme and modify footer template (footer.php file in theme directory).
More info about child themes: https://developer.wordpress.org/themes/advanced-topics/child-themes/
I hope it helps you a bit.
If you need developer’s help you may take a look here: https://blogonyourown.com/customization/
Best,
Patryk