`edx_catalog_extensions` Enable Extenstion in Discovery

I wanted to create Program in which multiple courses will be shown. I am not able to figure it out. I have studied in documentation that this is very advanced version of extension which we have to enable to get most out of Discovery That is why why I wanted to enable this extension. I am using Tutor with Nutmeg version. I have not found any documentation for creating programs.

edx_catalog_extensions is disabled by default. EdX developers should add course_discovery.apps.edx_catalog_extensions to INSTALLED_APPS in a private.py settings file.

Please help me out and how i can do that.