Connecting to ZNC
You connect to znc using any ordinary irc client. You may configure your znc account via irc commands. You may find it a lot easier however to configure your networks and settings using the Web configuration module. In which case, you would navigate to http://znc.example.com:6667 or https://znc.example.com:6697 depending on your port/ssl configuration.
If you have multiple irc networks setup under your znc account, you may connect to a specific one directly by adding /networkname to your username like so