Social Buttons

Hi, sorry for my bad english.
I try to set for the social buttons a blank site – so that for exp. the Facebook Site is opend in a new site and not on my website. Do you know what I mean? 🙂
Here the code from the header.php:

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

<?php
if ( has_nav_menu( 'social' ) ) {
wp_nav_menu(
array(
'theme_location' => 'social',
'container' => '',
'container_class' => 'menu-social',
'items_wrap' => '%3$s',
'menu_id' => 'menu-social-items',
'menu_class' => 'menu-items',
'depth' => 1,
'link_before' => '<span class="screen-reader-text">',
'link_after' => '</span>',
'fallback_cb' => '',
)
);

And if possible – do I change this in my child theme and how?

Thanks a lot
rita