How to set up a group to access the ftp server in ftp configuration and management?

In ftp configuration and management, how to set up a group to access the ftp server-general Linux technology-Linux technology and application information is as follows. Create a test group in linux, and use the three users test1, test2, and test3 to require the user test1 to have read, write, and execute permissions on the/home/test directory (that is, browsing, permission for downloading, uploading, and creating directories and files). Users test2 and test3 have only read and execute permissions for directories/home/test (permission for browsing and downloading)
I tried it, but it failed. What can I do ??