Excerpt Box not showing editor

https://artsalive.monadnock360.org

I want to use this for pages. Per your instructions, I added:
add_post_type_support(‘pages’, ‘excerpt’);

to functions.php
the excerpt box did not show the editor – just remained as it was. Per further research I tried:

<?php
add_action(‘init’, ‘my_custom_init’);
function my_custom_init() {
add_post_type_support( ‘page’, ‘excerpt’ );
}
?>

Still no change.

I expect I am missing something very basic.

Thanks for any advice on this.

Gordon Peery

https://www.ads-software.com/extend/plugins/rich-text-excerpts/