Display blog post img in home page

I have a post displaying an image correctly

- name: "featured-image"
  src: "blah.jpg"

Which is displaying correctly when you click on the blog post. However I want this image to show on my home page as a thumbnail like the example below.

What file do I edit??? I am using the DoIt theme.

This is a theme related question and it highly depends on your site sources and structure.

I would suggest:

And check your image location according ro the docs: Theme Documentation - Content - DoIt
“Local resource reference”.