How to open links to social media in new window/tab?

Hi Guys,

I found this topic as a solution for my issue:

http://wordpress.org/support/topic/how-to-open-links-to-social-media-in-new-windowtab?replies=9

but unfortunately I couldn’t find the right .php file to edit it

here is the website www . the royal music academy . com

I think I need to add target=”_blank” to the header.php file but the structure is not the same as the example in that link.

Here is what I have in header.php

<div class="container">

            <div class="eight columns">

                <div class="call-phone">
                    <i class="icon-phone"></i><span><?php echo slicetheme_option('interface_callus_phone'); ?></span>
                </div>
                <div class="call-mail">
                    <i class="icon-envelope"></i><span><a href="mailto:<?php echo slicetheme_option('interface_callus_email'); ?>"><?php echo slicetheme_option('interface_callus_email'); ?></a></span>
                </div>

            </div>

            <div class="eight columns far-edge">
                <?php slicetheme_socials(); ?>
            </div>

        </div>

I found this code in st_functions.php

function slicetheme_socials()
{
	$args = array('soc_facebook', 'soc_google', 'soc_twitter', 'soc_youtube', 'soc_vimeo', 'soc_flickr', 'soc_dribbble', 'soc_linkedin', 'soc_pinterest');

	$socials = slicetheme_option($args);

	$out = '[social]';
	foreach ($socials as $key => $social) {
		$name = str_replace('soc_', '', $key);
		if ( !empty($social) )
			$out.= '[item type="'.$name.'"]'.$social.'[/item]'."\n";
	}
	$out.= '[item type="RSS"]'.slicetheme_option('soc_rss', get_bloginfo('rss2_url')).'[/item]'."\n";
	$out.= '[/social]';

	echo do_shortcode($out);
}

and this in functions_options.php

//Social Settings
		$of_options[] = array(	"name" => "Social Settings",
								"type" => "heading");

								$of_options[] = array(	"name" => "Facebook URL",
														"desc" => "Enter the url to your facebook page.",
														"id" => "soc_facebook",
														"type" => "text");