Penci Design replied
Hi,
Please go to Customize > Genneral Options > then insert YouTube API Key option
Please check this guide https://developers.google.com/youtube/v3/getting-started?hl=en
If it still not woking ,please send me your api key and send me your website management information ( admin url site, username and password ). I will check it help you.
Best Regards,
PenciDesign