I have the same question, and I have not found it. The tutorials are all two years old, and do not provide enough info. Every one I have tried is not working as expected. You need to make Youtube videos to show this stuff. I see the same posts from others having troubles.
Sorry to be negative, but after paying for a theme, you’d think it should do what it was supposed to. I am running a plain site with no fancy add ons, and I can’t get Widgetized page to work. I just get unformatted junk on the left. The custom sidebar does not look like a sidebar at all. Almost like there is no CSS.