Ok, I just can't figure this out. I really don't want to delete my picture. I even made a space page but it won't let me upload it. I even tried Melanie's page. I followed the directions. So I guess it will have to stay on the sidebar.
See this help page: https://www.wikitree.com/wiki/Help:Photos_FAQ#How_do_you_remove_or_delete_a_photo.3F.
If you want to delete the photo completely, click on it and remove all the people and everything listed on the photo on the photo web page: to do this, click on "Add/Edit". The WikiTree system will then delete the photo within an appropriate time.