First, go to Divi -> Theme Options. On there, you can choose if you want to show or hide some Social Icons:

               

Then, at the bottom (Custom CSS) add the following code if you want LinkedIn and YouTube. If you want a different icon just change the content and the name. Open this link to see the full icon’s list:

Code

.et-social-linkedin a.icon:before {
content: “\E09D”;
}

.et-social-youtube a.icon:before {
content: “\e0a3”;
}

Now, in your File Manager:

1. Create a new folder “includes” inside your Divi child theme:

Inside the folder you have to copy the content inside social_icons.php, located in:

The final result is:

Add the next code at the end of your social_icons.php (the one that you have created) with your urls(before the ul tag):

<li class=“et-social-icon et-social-linkedin”>
<a href=Your URL class=“icon”>
<span><?php esc_html_e( ‘LinkedIn’, ‘Divi’ ); ?></span>
</a>
</li>
<li class=“et-social-icon et-social-youtube”>
<a href=Your URL class=“icon”>
<span><?php esc_html_e( ‘Youtube’, ‘Divi’ ); ?></span>
</a>
</li>

Save and you are done!

Note: for this tutorial you need a Divi Child Theme. I’m using this one, that is completely free, but you can use anyone.