I think you want to group the rooms. 
 

Je pense que vous voulez regrouper les chambres.

 yes, bedroom and kitchen and living room

Then follow the instructions in the linked (underlined) FAQ.

Suivez ensuite les instructions de la FAQ liée (souligne).

I spent 20 minutes, but I must not change the name of the place.
I have to put everything under "living room" and then they were connected, I don't understand anything.
We'll see, I still have 4 left to install

Remember, Sonos uses the term ‘room’ to be equivalent to ‘zone’. You can have many Sonos ‘rooms’ in a physical room inside your house. A ‘room’ is just a defined set of speakers. 
 

Rappelez-vous, Sonos utilise le terme "pièce" pour être équivalent à "zone". Vous pouvez avoir de nombreuses « chambres » Sonos dans une pièce physique à l'intérieur de votre maison. Une « salle » n'est qu'un ensemble défini de haut-parleurs.

I know, but I tried to associate the kitchen speakers and it didn't work, but when I put them in the living room like my first speakers which are in the living room, I was able to associate them.
So I have the same music in all the rooms of my apartment.
I am waiting to receive 2 more Era300 and 2 Era100 to complete my installation which I think will have to be called living room1-living room2 etc.
Thank you for your quick response