NodRED functionality is pre-installed and it has been hosted on 1880 port.
To access NodeRED use icon in Application section or open browser and hit "<gateway_IP>:1880"
New tab will open and and it might pop-up for user/pass if you are using it either first time or after long.
Credentials : user/pass --> atreyo/atreyo
After loggin in either you will have blank flow or any example flow saved by atreyo testing team.
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Above example flow is designed to fetch events of end devices, this flow will provide join, status, uplink, etc, events in debug.
To retrive data from events one should write function in NodeRED, then data can be send to external platforms.
Here is an example to retrive data and send it to MQTT, HTTP POST, and Things Board.