A folder or file’s permissions settings are a function of the file system.
On a Mac these are a folder or file’s UNIX permissions settings.
To set them, you have to use an app that allows you to see them.
The Mac Finder doesn’t do a good job of this. It gives you a simplified version when you Get Info.
You can see and folder and file UNIX Permissions using the app Path Finder. Use Path Finder’s Get Info for the selected folder or file.
BatChmod is a free utility that also allows you to set UNiX Permissions on selected files and folder.