You can watch the cbs news on amazon fire tv and here is general steps to install and watch CBS News on Fire TV:
1. First of all Power on your Amazon Fire TV and go to the search option.
2. Find the CBS News app, then click "Install."
3. Open the app for CBS News. Go to the section labeled Live Now. Choose the preferred live stream.
4. Take advantage of your Fire TV device to watch live news, weather, breaking news, and much more in real time!
Read more - https://www.waybinary.com/cbs-com-tv-roku-activate/