It does what it says it does

This requires modification and/or creation of template files. If you don’t know how to modify or create a template file this will not work for you. If you’re comfortable doing light modifications to template code, this works perfectly.

In short, unless you follow the directions and add custom content blocks to your templates, you’re not going to see a thing using this plugin. This plugin will not automatically create custom content blocks for you, and there is no fancy UI to help you do this.