First, add this repo to helm:
helm repo add kubetail https://kubetail-org.github.io/helm-charts/
helm repo update
helm search repo kubetail
Next install/upgrade/uninstall:
# install into the default namespace
helm install kubetail kubetail/kubetail
# install into a new namespace
helm install kubetail kubetail/kubetail --namespace kubetail-system --create-namespace
# install using custom values
helm install kubetail kubetail/kubetail --namespace kubetail-system --create-namespace --values ~/path/to/values.yaml
# upgrade an existing installation
helm upgrade kubetail kubetail/kubetail --namespace kubetail-system
# uninstall
helm uninstall kubetail --namespace kubetail-system