Actually that footer we customised on this file.

JoomlaFolder/templates/elegant/index.php

[gist type="php"]
<section class="footer">
<div class="container">
<div class="row-table cell-top visible-lg visible-sm">
<div class="col-cell">
<div class="col-cell pr-20">
<a href="http://facebook.com/StackIdeas" target="_blank">
<i class="fa fa-facebook"></i>
Find us on Facebook
</a>
</div>
<div class="col-cell pr-20">
<a href="; target="_blank">
<i class="fa fa-twitter"></i>
Follow us on Twitter
</a>
</div>
<div class="col-cell">
<a href="https://plus.google.com/+StackideasTeam/">
<i class="fa fa-google-plus"></i>
Add us on Google+
</a>
</div>
</div>
</div>
<hr class="visible-lg visible-sm">
<div class="row-table cell-top">
<div class="footer-copyright pull-left small">
© 2009 - 2016 <a href="http://stackideas.com">Stack Ideas</a> Sdn Bhd. All rights reserved.
</div>
<div class="footer-note text-right small muted">
Joomla! name is used under a limited license from Open Source Matters in the United States and other countries.<br>
StackIdeas.com is not affiliated with or endorsed by Open Source Matters or the Joomla! project.
</div>
</div>
</div>
</section>
[/gist]

Try take a look of my attached screenshot below which line of code have to replace my above code.