Basic mqtt Mosquitto set up with basic Hassio

I am trying to setup my MQTT function in hass.io.

I found several threads that point to this setup instruction.
Steps 1 & 2 completed

Step 3: Once back on-line, return to Configuration > Integrations and select configure next to MQTT.

However, there is no “configure” button on my page. What am I doing wrong?

Working through a sample help thread, it appears there is an internal broker and an external broker? (see Florian’s reply, about 5 replies down).
How do I know which one to use?

in my configurations.yaml file, I have added

  mqtt:
Broker: YOUR_HASSIO_IP_ADDRESS
  Port: 1883
  Username: MQTT_USERNAME
  Password: MQTT_PASSWORD
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A post was merged into an existing topic: Setting up mqtt on hassio very basic and early steps