Service graph configuration

Hi !

Im trying to set up the service graph in grafana following this page :

and I have installed both grafana agent-traces & metrics

but when I m looking at this conf :

server:
  http_listen_port: 12345
metrics:
  configs:
    - name: default
      scrape_configs:
        - job_name: local_scrape
          static_configs:
            - targets: ['127.0.0.1:12345']
      remote_write:
        - url: <remote_write>

may I know where to get /set the “<remote_write>”?

also, "http_listen_port: 12345", the port 12345 here can be used directly right? I dont need to change it.