Go to Admin -> Online Store -> Themes -> Customize -> from the Preview frame redirect to a Blog landing page (by clicking on blog link on the website or type it on browser URL bar).
You can config blog sidebar by click in section Blog Sidebar
We have 8 types of widget: Search input, Image, Newsletter, Text content, Categories tree, Social, Tags and Blog lists.
To add a widget to blog sidebar, click on Add content and select the type of block you want.
Search input: Search articles.
Image
Text content: Define title & html content will show on page.
Blog list: Define title & the collection of blog list.
Newsletter: Define title & newsletter subcribe.
Category tree: Define a navigation.
Tags: Define all tags of this blog.
Open Sections - Blog landing, in here you can change the number of Articles per row & number of row per page.
2. Blog post page
Go to Admin -> Online Store -> Themes -> Customize -> from the Preview frame redirect to a Blog post page (by clicking on blog link on the website or type it on browser URL bar).
Open Sections - Posts, in here you can show or hide the Author name, publish Date, social sharing button, tags of post and show next/prev button