Download the app for free from the App Store on your Apple TV. You can then use the demo content to test the basic features of Sigmondo.
To use your custom content (your own videos, images, logos or live streams) you will be able to unlock the extended functionality by an In-App Purchase. When you purchase a subscription, you will have a test period.
Find more information about the In-App-Purchase (Auto-Renewing) under the following link: