Thanks for the example page. Now, please do the following:
In the WordPress admin, go to Plugins -> Editor.
In the top right of this editor page, you’ll see “select plugin to edit,” so click on YouTube in the dropdown. Then click the select button.
In the editor, scroll down to line 953, which is:
$jsonResult = json_decode($apiResult['body']);
Under that line, paste this line:
return '<pre style="text-align: left;">' . print_r($apiResult, true) . '</pre>';
Then click on the “Update File” button at the bottom of the page.
Tell us when you have done this.