I found the answer:
In an open Finder window, click "Application," select"Utilities," choose "Terminal" and double-click the "Terminal" application to launch it.
Type "sudo rm –f " (with a space after the f and not including the quotes) to delete a file.
Type “sudo rm –rf ” to delete a folder.
Drag and drop the files you wish to delete onto the open Terminal window. The files you drop on the Terminal window will be deleted. You can drag and drop multiple files and folders onto the Terminal window.