Customize Jetpack Related Post feature

I’m using Jetpack Related Posts to display related posts in my blog posts. Currently, the related posts display at the end of the post. I’d like them to display within the post body.

I’m using the General News theme. When I go to the Related Posts theme customizer it says I can only customize within “single post view.” I can see a single post displaying in the customizer. But I cannot customize. HOw do I find a “single post view” which I can customize?

The page I need help with: [log in to see the link]