kubectl, Infra App looks for your default Kubernetes configuration file (also commonly referred to as KubeConfig) to discover clusters. This file is found under:
~/.kube/config on macOS and Linux
C:\Users\<your user>\.kube\config on Windows
Some Kubernetes providers (such as IBM Cloud or Digital Ocean) don't use the default Kubernetes config file. Infra App can connect to these clusters as well. Simply click on the Cluster Switcher and then Add Configuration...
If you're still having trouble connecting Infra App to your cluster, feel free to shoot us an email