Cannot access Django site using a Service

I’m following this tutorial: How To Deploy a Scalable and Secure Django Application with Kubernetes | DigitalOcean

I’m stuck in Step 7 - ## Allowing External Access using a Service now.

I configured my service file, and I can view my port and External IP address

(projectenv) D:\Interscale\Project\CustomerPortals\Customer_Portals\backend\myproject\yaml>kubectl get svc app
NAME   TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
app    NodePort   <Cluster-IP>   <none>        8000:<My Port>/TCP   17s

(projectenv) D:\Interscale\Project\CustomerPortals\Customer_Portals\backend\myproject\yaml>kubectl get node -o wide
NAME                           STATUS   ROLES    AGE    VERSION   INTERNAL-IP   EXTERNAL-IP     OS-IMAGE                         KERNEL-VERSION           CONTAINER-RUNTIME
client-portal-nodepool-qjfch   Ready    <none>   3d5h   v1.25.4   <InternalIP>    <My External IP>   Debian GNU/Linux 11 (bullseye)   5.18.0-0.deb11.4-amd64   containerd://1.4.13

But when I’m trying to access my site, I got this error: # This site can’t be reached

<My External IP address> took too long to respond.

This is the format I input in site: http://<External IP address>:<Port>/admin/

And I runned my django project locally at first, it works fine.

I think the problem is because I’m using the Private Docker Registry. I checked the tutorial in Kubernetes setting the credentials. But I think the configuration process is not so clear. This is the tutorial link: Pull an Image from a Private Registry | Kubernetes

I don’t know what should I put for <your-registry-server>.

kubectl create secret docker-registry regcred --docker-server=<your-registry-server> --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email>

and I don’t know how to import the ‘regcred’ when I have created it.

So I just modified my Deploy.yaml file like this:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: portals-app
  labels:
    app: app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
        - image: xichen9718/portals_docker_repository:latest
          name: app
          envFrom:
          - secretRef:
              name: app-secret
          - configMapRef:
              name: app-config
          ports:
            - containerPort: 8000
              name: gunicorn
      imagePullSecrets:
        - name: regcred

Can anyone help me with this problem please