Selinvarol on "[Theme: Spun] Change Sentence in Footer"

so, if I just copy paste the below will it work?
It did not work with me, do I need to copy paste all footer .ph from actal theme to child then do the change?

<div class="site-info">
<?php do_action( 'spun_credits' ); ?>
COPYRIGHT © 2014 CEVIZ HANE
<span class="sep"> | </span>
ALL RIGHTS RESERVED
</div><!-- .site-info -->

Thanks,
Selin