At some point in the year a form arrives which relates to the TV licence. If you have a TV you do nothing with the form and the licence fee will be charged at the same time as the taxe d'habitation. If you don't have a TV you have to opt out and complete the form to do so.
Our form just asked if we had TV in house, & was house a 2nd home & were we foreigners lol. We only started to receive the form about 4 years ago although we have had the house for 10 years & it now just gets added onto our tax habitation or tax foncier can't remember which one.