If you cannot delete the folder using Mac Finder (or Windows File Explorer), you could try using one of the WD mobile apps,or WD Desktop software or the MyCloud.com web portal to delete the folder/files. One could also, if the files are in their own Share, try removing the entire Share via the My Cloud Dashboard. Or one can access the My Cloud at the root level via SSH and remove the folder or files at the command line level (or using a SSH GUI program like WinSCP).