If you can invest an Internet account (Tunein.com) to the bookmarks simply structured, group (in folders) and complement. These settings apply equally to PC and TV app.
The podcast management app was not working perfectly for me. I could just add a single podcast. About the web portal that went but problems.
The optical audio output of the small box "Amazon Fire TV" I have connected via a "Digital Audio Converter" by RCA on my music system. This way I can after a successful TV channels on TV the TV set then issue again.
The HDMI connection of the TV, however, leads to Amazon Fire TV ended the stream when issuing the TV set. Then just restart the play button of the remote control at Amazon off the TV streaming again.