First, as mod description say, adding this to existing game is not supported - if you will follow this guide and your save will break, it's your fault.

The way game saves radio/tv state is that on creation of new game it create state file of all radios/tv - when you add any mod that modifies radio/tv data to existing game, it will not be working (unless mod gave logic to check and add this, but we can assume it will not).

What you can do is copy this state form one save to another one, however your current watch/listen progress will be wiped. I've did not test if this will allow to re-watch already watched training classes and give you XP... and frankly, do not care if it does :)

1) enable all radio/tv mods in your existing game, start game and exit it
2) create new save game with all radio/tv mods enabled exit it
3) go to your save directory (google up where that is, don't ask)
4 - optional) create copy of your normal game play save (preferably create archive like tgz, rar, 7z)
5) from new save game copy radio/data/RADIO_SAVE.txt to normal game play save directory overriding existing file
6) start your normal save and manually tune to radio/tv - presets will not be auto-populated (they might be on non discovered map chunks)
7) if it broke your save, erase save game and extract it from backup (the step 4 that you skipped)
8) if it broke your game (still?) - don't complain to me, game devs nor this mod dev.