How to make changes to smb.conf?

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX2
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If you look at this post of mine, you’ll see ways to make changes to smb.conf take effect without requiring firmware manipulation…though changes will be lost on reboot…but I think this is an easier approach than trying to figure things out in firmware. http://community.wd.com/t5/WD-My-Cloud-EX2/Hacks-to-make-Public-share-and-USB-shares-private/td-p/728740