How to add social media icons?

thats why i wrote: If it is too much. there are possibilities to make it manually.
This above adds an additional widget! not a widget-area. So you only have to pull that widget to any footer widget area you like.
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another way is to create a shortcode for that social media icons – and that comes into child-theme functions.php too:

function social_bookmarks_shortcode() {
$social_args = array('outside'=>'ul', 'inside'=>'li', 'append' => '');
$social	= avia_social_media_icons($social_args, false);
return $social;
}
add_shortcode('social-bookmarks', 'social_bookmarks_shortcode');

this to quick css: ( just to show the list-items besides each other)

#footer .widget ul.social_bookmarks {
    display: inline-flex;
}

you can now put in a text widget (Any heading you like) : [social-bookmarks]

This is the fastest method – the one above in my first posting is elegant but maybe to complicated.

By the way you mean realy : #footer not #socket as Ismael asked here: https://kriesi.at/support/topic/how-to-add-social-media-icons/#post-1133902
for socket there is an option on Enfold Options

Off Topic:
if you are interested in a child-theme usage – and maybe you read even why it is a good idea to have one :
https://kriesi.at/documentation/enfold/child-theme/
or on WordPress Codex : https://developer.wordpress.org/themes/advanced-topics/child-themes/ (by the way dear mods – change that in your documentation – new link)

these snippets here on board which helps to customize a theme – are better placed to a child-theme. Not only because those changings are not lost after an update of the parent-theme.

In principle it is of course also possible to place the snippets in the original file functions.php ( at the very bottom of it – just after that comment ),

/*
 *  register custom functions that are not related to the framework but necessary for the theme to run
 */

but I don’t find it advantageous, because the functions.php of a child-theme is empty at first, so it is much easier to fill it. You can add comments to the snippets so that you can keep track of them.
A short comment in a php file can be achieved by // these to slashes in front of a comment .
If you got more than oneliners you see often this f.e. ( part of the top of original functions.php):

/*
 * if you run a child theme and dont want to load the default functions.php file
 * set the global var below in you childthemes function.php to true:
 *
 * example: global $avia_config; $avia_config['use_child_theme_functions_only'] = true;
 * The default functions.php file will then no longer be loaded. You need to make sure then
 * to include framework and functions that you want to use by yourself. 
 *
 * This is only recommended for advanced users
 */

Unlike style.css, the functions.php of a child theme does not override its counterpart from the parent. Instead, it is loaded in addition to the parent’s functions.php. (Specifically, it is loaded right before the parent’s file.)

etc. – i would advice you to use a child-theme.