It works. Thanks!
I read in footer.php:
// you can filter and remove the backlink with an add_filter function
// from your themes (or child themes) functions.php file if you dont want to edit this file
// you can also just keep that link. I really do appreciate it ;)
$kriesi_at_backlink = apply_filters(“kriesi_backlink”, ” – Enfold Theme by Kriesi“);
Can you write me code for functions.php in child theme for removing or editing of this line? Maybe it is totally beginner question but I am beginner in child theme options. Thanks for help!