Blog Way is minimal WordPress theme. We have not included option to show author and post date in blog list/detail page to make design clean and simple.
You can use plugin or add it through child theme. However, we will try to add this feature in upcoming version of our theme.
You need to know how to create child theme for it and how to override hooks/templates from child theme. We cannot provide complete code for child theme as it is out of support scope.
If you can do some research you can easily do it yourself or hire customizer for it.