Footer Changes – Request

Hi Folks,
I want to edit the Footer info and I’ve done some reading on the thread and can’t seem to figure out what I’m doing wrong. I’ve never created a child theme so I suspect it has something to do with this. Let me explain what I’ve done:

1. Created a directory called: attitude-child in my themes subfolder.
2. Created a style.css and pasted this in it:

/*
Theme Name: Attitude Child Theme
Author: Self-Help WordPress User
Template: attitude
*/

@import url("../attitude/style.css");

3. Created a functions.php and pasted this in it:

<?php

// Remove old copyright text
add_action( 'init' , 'mh_remove_copy' , 15 );
function mh_remove_copy() {
        remove_action( 'attitude_footer', 'attitude_footer_info', 30 );
}

// Add my own copyright text
add_action( 'attitude_footer' , 'mh_footer_info' , 30 );
function mh_footer_info() {
   $output = '<div class="copyright">'.'Copyright ? [the-year] [site-link] Maintained by: <a href="https://www.basicwebdeveloping.com">Basic Web Developing</a> Tel: +44 (0)20 7630 9271 <br />
Source theme: <a href="https://themehorse.com" target=blank>Theme Horse</a>.'.'</div><!-- .copyright -->';
   echo do_shortcode( $output );
}

And then I saved it all. And I see that nothing has changed. I think I’m missing some silly step here but any help on this would be appreciated. You can check out the site at https://www.fredericksagency.com

Thanks for any help!
Steve