Adding Apps

Go to the Samsung store and search for “Fox Nation” there. You can then login with the credentials used to sign up. 

More info here:

https://help.fox.com/s/article/How-do-I-watch-FOX-Nation-on-Samsung-TV

Quick question, did you sign up through your DIRECTV service or sign up through the website (standalone subscription not through TV provider)?

I signed up through the Fox Nation website. They were offering it for $1.50 per month for a year.

Sounds good. Just follow the steps and it should work fine.