followed the steps and failed.

[bayeslearner]

oc create namespace openebs
namespace/openebs created
oc adm policy add-scc-to-user privileged system:serviceaccount:openebs:openebs-maya-operator
clusterrole.rbac.authorization.k8s.io/system:openshift:scc:privileged added: "openebs-maya-operator"
oc adm policy add-scc-to-user privileged system:serviceaccount:openebs:default
clusterrole.rbac.authorization.k8s.io/system:openshift:scc:privileged added: "default"

After that, I installed and created the install template:

   failed installation (storageclasses.storage.k8s.io is forbidden: User
    "system:serviceaccount:openshift-operators:openebs-operator" cannot
    create resource "storageclasses" in API group "storage.k8s.io" at the
    cluster scope) and failed rollback: uninstallation completed with 2
    error(s): storageclasses.storage.k8s.io "openebs-hostpath" is forbidden:
    User "system:serviceaccount:openshift-operators:openebs-operator" cannot
    delete resource "storageclasses" in API group "storage.k8s.io" at the
    cluster scope; storageclasses.storage.k8s.io "openebs-device" is
    forbidden: User
    "system:serviceaccount:openshift-operators:openebs-operator" cannot
    delete resource "storageclasses" in API group "storage.k8s.io" at the
    cluster scope