In order to view USTVNow on your Firestick device make sure you are already a subscriber.
Open the Firestick native browser Silk or Chrome if installed;
Go to the optimized interface URL https://tv.ustvnow.com/
Tap on "Sign in" or any channel logo;
Type in your USTVNow username and password and tap on "Login"
You can always open a support ticket if you need further assistance or check out this Youtube video for a step by step guide.
Note: This is an optimized URL for web-enabled devices and only LIVE and recorded content is available. We hope to add more features to this interface soon. For full website functionally please go to https://www.ustvnow.com from another device.