The Lock menu of Folder Guard offers the following commands:
This command starts the Wizard that guides you through the steps necessary to password-protect the folder currently selected in the Folder Guard window. You can use this command to add a new password, or change or delete an existing password. This command is disabled if no folder is currently selected.
This command removes any the passwords from the currently selected folder. This command is disabled if no folder is currently selected in the Folder Guard window, or if the selected folder is not password-protected.