N 360 Manage Backup Sets incomplete (AndMike ?)

N. 360 and NOBU in win 7.  Trying to delete NOBU sets and files.  Main N website Help "DELETING A BACKUP SET" tells me to go to Backup > Backup Sets > Summary > Backup Set Name > Things You Can Do > Delete Backup Set and Files option.  My version N. 360 does not have the "Backup Sets" option under Backup.  If I use Backup >Manage Backup Sets, I only see the current default Set - none of the other 3 shown Computer > Norton Backup Drive  show up in Manage Backup Sets -- Backup Summary -- Backup Set Name, as the HELP suggests.

AndMike in previous thread told me how to delete from Computer > Norton Backup Drive by right clicking.  Have done so and managed to delete all the files from the two old backup sets I'm trying to get rid of.  But the backup set names still appear in the NOBU Drive but do not appear in the Backup Set Name window; nor does the other active Backup Set being used for my other computer (which I'm not deleting, of course).

How do I get rid of the two old Backup Set names from the Drive, and get both active Sets to show up in Backup >>> Backup Set Name so I can highlight the one I want to work with?