How do you access the api command line to send requests

I can’t seem to access the command line, all the documentation says that it should be be from typing in http://IP_ADDRESS:8123/api/ but that doesn’t seem to work for me
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I am quite confused, I use HA supervised on a raspberry pi 4.

Documentation: REST API | Home Assistant Developer Docs (home-assistant.io)

From the link:

For example:

rest:
- resource: http://homeassistant:8123/api/hassio/supervisor/stats
  verify_ssl: false
  headers:
    Authorization: !secret ha_api_token ### <---- THIS
    Content-Type: application/json
  scan_interval: 29
  sensor:
  - name: "Supervisor CPU"
    value_template: '{{ value_json.data.cpu_percent|round(2) }}'
    unit_of_measurement: '%'
  - name: "Supervisor RAM"
    value_template: '{{ value_json.data.memory_percent|round(2) }}'
    unit_of_measurement: '%'