How to deploy a WordPress in Rancher

I read this link and this one to see how to deploy a simple WordPress application but I cannot.
With the first link I get error that PVC is not bound, and with the second link I get this error in the kubectl describe pod_name:

pod has unbound immediate PersistentVolumeClaims

I even tried manually to run kubectl apply -k . as per in k8s docs but it failed.

I run rancher on docker: docker run -d -p80:80 -p443:443 --privileged rancher/rancher:latest.

Do you please help me how to run a WordPress application to run?