In order to manage an iOS or tvOS device with Full Management, you will need to define an MDM Server in Configurator. For full instructions how to manage an tvOS device with Full Management check out: tvOS: Deployment Guide - How to enroll a tvOS device
How to define an MDM Server in Configurator
1. Open Configurator and navigate to Preferences by clicking "Apple Configurator 2" > "Preferences". Go to the "Servers" tab.
2. Click the "+" to define a new MDM Server. Click "Next" and enter the name Fleetsmith and the following URL provided in your Fleetsmith web app.
You can invalidate this URL and generate a new one on the Preferences
3. Click "Next" and the Fleetsmith MDM Server will be created in Configurator 🎉