The location is theme folder -> inc folder -> extra-functions.php
you can put any html above line 42 which is:
</div>
The html will output after the social icons
For eg.
<a class="email" href="mailto:[email protected]" target="_blank"><i class="fa fa-envelope"></i></a>
The above addition will give you email icon.
It will require custom work to do exactly like your screenshot, to get quote email [email protected]