Sidebar alignment

I am having trouble with the alignment of our sidebar.
Have deactivated and reactivated all plugins.

https://www.kjzrradio.com

Have run the validator and found these errors,

https://validator.w3.org/check?uri=www.kjzrradio.com&charset=%28detect+automatically%29&doctype=Inline&group=0

I don’t have a clue as to how to fix validation errors…header, index, sidebar, etc. What to do?

Thanks