YouTube API Self hosted Issue..

Hi all,
I have a self-hosted WordPress blog at https://www.RevivalOrRiots.org — and I’m trying to link it to my YouTube page…I have looked thru the support pages and found some information, and I have grabbed the API key from WordPress.com—and I even put in the API URL as https://www.revivalorriots.org/xmlrpc.php just like it says to,
but YouTube is still giving me an error. Any ideas?