go to design -> Editor and open Header.php
scroll down till you find
[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]
<?php if ( get_theme_mod( 'gridsby_fb' ) ) : ?>
<li>
<a>">
<i class="fa fa-facebook"></i>
</a>
</li>
and add target=_blanc. So after that it should look like this:
<?php if ( get_theme_mod( 'gridsby_fb' ) ) : ?>
<li>
<a>" target="_blanc">
<i class="fa fa-facebook"></i>
</a>
</li>
continue with the other social media platforms
