I made the changes as suggested. However, under Appearance-> Widgets I still get:
“No Sidebars Defined”
The theme you are currently using isn’t widget-aware, meaning that it has no sidebars that you are able to change. For information on making your theme widget-aware, please follow these instructions.”
Can anyone suggest what I can try now? I can put the code I used here if that would help. I appreciate your time and attention very much.