A very simple lightweight plugin which makes YouTube and other default WordPress video embeds responsive
There isn't one. This is a lightweight plugin with no options, so there is no need for an admin page.
You can copy the css rules from the plugin's stylesheet into your child theme's stylesheet and prevent the built-in styles from loading by adding the following line to your child theme's functions.php or a custom functionality plugin:
<?php remove_action('wp_print_styles', 'cc_ductile_embed_css', 30); ?>
You can donate via my donation page
If you find the plugin useful I would also appreciate a review on the plugin review page
If it isn't working for you, please read the documentation carefully. If this does not address your issue, please post a question on the plugin support forum so we can at least have an opportunity to try to get it working before you leave a review.