@Pande37021
When you install channels/apps, try to install them either using the online Channel Store, or using the Search feature from the left hand side menu on the Home Screen.
https://channelstore.roku.com/search/fox-nation
When you open Fox Nation, you should see some plans/pricing. Right below that is "Already have an account?" and a large 'Sign in" buttion. Use that one to enter your existing Fox Nation login credentials (the one you are using to watch on your phone).
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102