Pulling data from I2C to gauge

Guys I really dont know how to get temperature data from my sensor.
I use MCP9808 and I want to use node-red-contrib-i2c.
I got already sensor adress which is 0x18
Now I know that if I want to pull data from sensor I have to use 'i2c in' node- but what should I type there.
I've got it like that:

Gauge shows:
I don't quite understand all bit stuff. What is this bus adress, what is this command bracket?
Thank u for help

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