How do I promote a worker node to a control plane node?

I have been googling this quite a bit and not found a single answer. When you deploy a Kubernetes cluster here, you are giving all worker nodes. No master. So how are you supposed to do port forwards or install helm charts for instance? I can't find a single mention of this on Google. Maybe I'm missing something, but isn't this doing Kubernetes with your hands tied around your back?

Thanks,
Steve