Protect Application With Traefik SSL Letsencrypt in kubernetes

I just begun learning kubernetes. I made an account in digital-ocean and started a kubernetes cluster. Then I tried following this article https://www.digitalocean.com/community/tutorials/how-to-secure-your-site-in-kubernetes-with-cert-manager-traefik-and-let-s-encrypt. But I'm having some questions about how it works. Right now my situation is this one:

kubectl get pods,services,deployments
NAME                                   
pod/app-frontend      
pod/app-backend       
pod/cm-acme-http-solver-qh8ms          
pod/company-service    
pod/edge-service      
pod/location-service  
pod/traefik           
pod/traefik-deployment 
pod/user-service      

NAME                                TYPE           EXTERNAL-IP       PORT(S)                   
service/app-frontend                LoadBalancer   app-ext-ip        3000:32459/TCP            
service/app-backend                 ClusterIP      <none>            5432/TCP                  
service/cm-acme-http-solver-fcgpr   NodePort       <none>            8089:30577/TCP            
service/company-service             ClusterIP      <none>            9003/TCP                  
service/edge-service                ClusterIP      <none>            9000/TCP                  
service/kubernetes                  ClusterIP      <none>            443/TCP                   
service/location-service            ClusterIP      <none>            9002/TCP                  
service/traefik                     LoadBalancer   traefik-ext-ip    80:32591/TCP,443:30716/TCP
service/traefik-dashboard-service   LoadBalancer   tr-dash-ext-ip    8080:31431/TCP            
service/traefik-web-service         LoadBalancer   tr-ws-ext-ip      80:31211/TCP              
service/user-service                ClusterIP      <none>            9001/TCP                  

NAME                              
deployment.apps/app-frontend     
deployment.apps/app-backend     
deployment.apps/company-service   
deployment.apps/edge-service      
deployment.apps/location-service  
deployment.apps/traefik           
deployment.apps/traefik-deployment
deployment.apps/user-service  

So I have Traefik working but not acting as proxy, the app-frontend working, but not in https, the certificates issued by letsencrypt not being used anywhere. for example

kubectl get issuer -o wide
NAME             READY   STATUS 
challenge-http   True    The ACME account was registered with the ACME server
kubectl get certificateRequest -o wide
NAME                          APPROVED   DENIED   READY   ISSUER           REQUESTOR                                         STATUS                                                                                                 AGE
    tls-app-ingress   True                False   challenge-http   system:serviceaccount:cert-manager:cert-manager   Waiting on certificate issuance from order default/tls-app-ingress-http: "pending"
kubectl get certificates
NAME                    READY   SECRET                  AGE
tls-app-ingress-http   False   tls-area-ingress-http   166m

And of course since I am learning from scratch, everything is in the default environment. How do I tell kubernetes to use Traefik as a proxy and arrive to the app-frontend via https? I'm not offended if you answer me with some documentation to read, just point me in the right direction.