Hi,

We can add it to your site with child theme.

First, we need necessary icons as font or image file.

Tomorrow I will try to prepare child theme for you and give instructions.

Please check theme in attachment.

In footer.php file in child theme you need to change links:

                                    <li class="mail"><a href="http://link-to-mail" target="_blank" title="mail">mail</a></li>
                                    <li class="youtube"><a href="http://link-to-youtube" target="_blank" title="youtube">youtube</a></li>

You need to install and activate child them. Them change code for correct socials links in footer.php file in child theme directory.

Did you activate child theme in admin area?

Try to simply install and activate theme with zip archive that I attached.

Sorry, forgot about this.

Please change code in footer.php fie like this:

<li class="youtube-link"><a href="http://link-to-youtube" target="_blank" title="youtube">youtube</a></li>

And in style.css like this:

.socials li.youtube-link a:after {
     content: '';
     background: url('images/youtube.png') no-repeat 50% 50%;
     background-size: cover;
}