Hi,
I have map services published on federate ArcGIS Server and Portal for ArcGIS.. I want to secure the map services by assigning username and password to them. If I go to ArcGIS Server I am getting the message "The user store is managed by Portal for ArcGIS. To view and modify users, log in to your portal."

Any idea how to assign username and password to Mapservice using Portal for ArcGIS.
Thanks
Aditya