Kubectl is a powerful tool for interacting with Kubernetes clusters. For installation, see official documentation. After installation, a kube config file is required to function. The file is located in cluster overview dashboard (click on the cluster name in the upper left dropdown menu).

kube config

Copy contents of this file into $HOME/.kube/config and change permissions to 700 (chmod 700 $HOME/.kube/config).

NOTE: If the file $HOME/.kube/config does not exist, go ahead and create it, then copy the contents

It is possible to have multiple cluster configurations in one config file. More about working with kubectl with access to multiple clusters here.