info on Identify Web Server User
Be sure you have completed this task also:
Well, you should get familiar with config files, 'cause they are most important if you want Nagios to monitor devices the way you want.
Add something like this in host definiton (everything is well explained in official documentation, so it is advisable for you to read it and understand how Nagios works):
alias Nagios server
Then define, for example, checkping service for localhost, and then add host to hostgroup and service to servicegroup if you want to see them in web GUI.
I'm not sure if there is web interface for adding users/passwords, you can check that on
But there are some plugins for managing host and services from web interface: