SOLVED - found the answer in a forum after posting -
needs to be more obvious for 'read the manual over my dead body types , like me ]
Add event to SaberDAV ICAL server requires Username /Password for authentication
Where do I enter this ? or is it as the label suggests ‘Subscribe’ and is read only - in whcih case you need to remove the 'add event ’ from the options , as without it - you cannot
[was hoping to finally turn off Outlook 2013 but without the iCAL , currently provided by the Bynari WebDav connector … it is a no can do