Hi -
First you'll need to make sure that you have the relevant communication settings configured for the device (Edit Device and scroll down to see):
(the settings/username etc that you choose are obviously dependent on your device and environment).
As to settings on the device, if the test button in the screenshot above works then you won't need to change anything. If the connection fails, you'll need to look at ACLs/permissions etc to troubleshoot why NCM can't connect.
Regards,
John