To add a new machine deployment navigate to your cluster view and click on the
Add Machine Deployment button:
In the popup you can then choose the number of nodes (replicas), kubelet version, etc for your newly created machine deployment. All nodes created in this machine deployment will have the chosen settings.
To add or delete a worker node you can easily edit the machine deployment in your cluster. Navigate to the cluster overview, scroll down to
Machine Deployments and click on the edit icon next to the machine deployment you want to edit:
In the popup dialog you can now in- or decrease the number of worker nodes which are managed by this machine deployment, as well as their operating system, used image etc.: