SOLVED ! Internet Calendar - where to I enter the Username/Password required for SabreDav based DAV servers

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