Thanks for your reply
I want to add widgets and then make sure the sidebar displays on my youtube page.
I do not understand your answer as when I find my sidebar block in Elements there are no options available.
I am feeling really despondent as I have been trying for a could of days and I cannot resolve this issue.
Are there any plugins you know of that definitely work -that I could try instead.
Do you think the fact that I am working on a staging sire with Jetpack save mode could have anything to do with it?