Can't edit or create network folders on USB drive connected to router

I've attached a USB drive to the backside of my WNDR3400v3 router and followed the instructions to connect to it using readyshare.  I've renamed the share to \\Router\USB_Storage.  It appears in Windows Explorer as it should as a network "computer" and as a disk drive in the list of drives.  I've copied files and directories to it, edited them, saved them and deleted them.  It all works just fine, EXCEPT when I log into the router and try to edit the share name or create a new folder.  When I click on Edit or Create New Folder, the window refreshes with the same information.  It doesn't open the Edit/Create window shown in the user manual.

How do I go about editing/creating new folders?  Thanks!