How to access file on webmin server when you don’t have permission …

So how could I solve this issue? Could you send me a procedure to give this account “logistics.controller2” access to file “logistic” on the server? We are using “webmin version 1.760” running on “CentOS linux 6.7” I am not familiar yet with CLI commands reason why I am using the GUI interface of webmin.

https://www.turnkeylinux.org/forum/support/20160119/how-access-file-webmin-server-when-you-dont-have-permission