Custom Sidebars Pro, left sidebars widgets

Hello, in the description of plugin "customs sidebar pro" written that I can create sidebars where I want. I would like to create the left column on the page or Left sidebar widgets, but can't find option to do.
Once when I had the blog on I could create sidebars in the left column. Can I do it using Custom Sidebars plugin Pro? Could you explain me how to do it please?
In attached file I send you the example of my page. Carrying the theme Opti from to, left widgets remained, but now I can't change it anymore.