Help me figure out why I can't share a drive on my Windows 7 machine.

The drive I want to share is a "SHARE" of a external storage WDMYCLOUD drive. I can see the drive fine in Windows Explorer, but if I try to "see" it from other devices on my network, I cannot. I have tried to "share" it as I have done with other folders on my "C" drive, but I cannot seem to figure out how to do that. I need you to use "Teamviewer" or similar screen sharing tool to enter my machine and fix this sharing problem. This is a video explaining the problem> [login to view URL]