The Kubernetes Dashboard is a general purpose, web-based UI for Kubernetes clusters. It allows users to manage applications running in the cluster and troubleshoot them, as well as manage the cluster itself.
For more information also have a look at the Kubernetes Documentation.
Note that after installation everyone with "Editor" permissions has access to the Kubernetes Dashboard and thus also full admin access to the cluster.
For information on how to install and uninstall an Add-On see MetaKube Add-Ons.
There are no customization options.