Unable to get new setup working, help appreciated

Beginner warning: I’ve built a hass.io server on a spare rPi, and seemingly have setup zigbee2mqtt & Mosquitto broker. I’ve ‘believe’ I’ve managed to pair TRADFRI driver for wireless control (30 watt), from what I can see in the logs, but I don’t see any devices within ‘Configuration > Integration’
Any ideas?

Would really appreciate somebody looking through the step’s i’ve taken to see what I;m doing wrong. Thank you.

Also if anyone can point me to any references so I can understand what a Mosquitto broker does, and how these devices communicate. Thanks