Thank you,
Really very kind.
I have disabled AdBlock Plus and now I have solved it.

Now I ask for information: who will browse my site with AdBlock Plus active, will not see the icons?

Best regards

Thanks Mike,
really kind. I followed your instructions on the child theme folder.

However, I still can’t see the button to add social icons to the header, on the dashboard of the Enfold Child theme Options.

Do you have any suggestions?

Best regards

P.S.: when you say “style.css & functions.php should be mostly empty except the comments.”
what do you mean by “comments”? Sorry for my misunderstanding.