Cannot embed channel

Hello

I am trying to use this plugin to display this channel:

https://www.youtube.com/user/OrmsChristadelphians

On this page:

http://ormskirkchristadelphians.org.uk/meeting-us/videos-of-talks/

However, when I use the wizard I just get the message “Please periodically check the YouTube plugin tab on your admin panel to review the latest options” and it doesn’t work. Any suggestions please?