Displaying custom taxonomy in Event Placeholder

OK, I see from this page: https://wp-events-plugin.com/tutorials/using-additional-custom-taxonomies/ I’m supposed to add some code, and the instructions say “add this code, it’s that easy” but it doesn’t say where. A lot of your documentation is assuming we’re all whizzes at going under the hood in WP.

As for where to paste custom snippet or code – https://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/

OKay, I finally found time to tackle this again. So, I created a php file and put it in mu-plugins, and in that php file I added this:

<?php
function my_em_own_taxonomy_register(){
    register_taxonomy_for_object_type('participating_author',EM_POST_TYPE_EVENT);
    register_taxonomy_for_object_type('participating_author',EM_POST_TYPE_LOCATION);
}
add_action('init','my_em_own_taxonomy_register',100);
?>

and then I went to Formatting and for the Single Event Format section, I put this:

#_EVENTLINK #participating_author - #_EVENTDATES - #_EVENTTIMES

and it doesn’t show anything.