Creating a Blog Sidebar

To create a blog sidebar, you need to edit the blog post Structure.

1. Click on the hamburger menu at the top left of the toolbar.
2. Click on Structures > Set Defaults
3. Click on the Edit Structure button beside Blog Post

That will take you to the screen where you can edit your Blog Post Structure. Here, you can make whatever design changes you'd like. However, you will likely want to widen the width of the Row containing the content placeholder. And then create a new column for your sidebar.

This video shows how to accomplish that: