To change permissions for the selected files or folders, choose File > Get Info

The exact set of permissions available for editing will depend on the type of connection. For FTP/SFTP connections to a Unix-style server, you will see traditional Unix-style read/write/execute permissions.
The owner and group membership of the item can also be set from this window.
Click Apply to apply any changes you make.
Click Apply to Enclosed... to apply your changes to a folder and any sub-items it contains, recursively.
Not all servers support changing of permissions, owner, or group.
Related topics
Setting file permissions automatically after upload