Prometheus Operator: Cannot access Prometheus after expose the services

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I am following the documentation to create services operator. I am not sure why I cannot access the Prometheus services.

My apps.yml:

kind: Service
apiVersion: v1
metadata:
  name: sms-config-service
  labels:
    app: sms-config-service
spec:
  type: NodePort
  selector:
    app: sms-config-service
  ports:
  - port: 8080
    targetPort: 8080
    name: http

My ServiceMonitor yml:

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    app: servicemonitor-sms-services
  name: servicemonitor-sms-config-services
  namespace: metrics
spec:
  selector:
    matchLabels:
      app: sms-config-service
  endpoints:
    - port: http

Prometheus yml:

apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
  name: prometheus
spec:
  serviceAccountName: prometheus
  serviceMonitorSelector:
    matchLabels:
      app: servicemonitor-sms-services
  resources:
    requests:
      memory: 800Mi
  enableAdminAPI: true

Prometheus config yml:

apiVersion: v1
kind: Service
metadata:
  name: prometheus
spec:
  type: NodePort
  ports:
    - name: web
      nodePort: 30900
      port: 9090
      protocol: TCP
      targetPort: web
  selector:
    prometheus: prometheus

When I access the url below, browser shows "unable to connect". I am not sure where I did wrong? Should I set up a deployment for the exposer?

$ minikube service prometheus --url
http://192.168.64.3:30900

Source: Docker Questions