Ok, I know all that I wanted to know, thank . :)
Yes, I know, this translator is bad :( .
I am astonished that nobody knows where the missiles are located.
On the next picture, you can see where those are located:
Between the wings at the front .
Here is a photo of my own Millenium Falcon. This one has an interior contrary to the new one 10179 .
On the next photo, you can see the 4 missiles and , the suspension (parts LEGO Technic,picture in top on the right.) who will projected them .If you don't see very well, on the picture you can go here :
Go here
You can see here the 4 LEGO "suspension" who will projected the missiles .
I built this part which enables me to push on the spring
/suspensions
It must push the spring and insert the Technic bar in the hole it to block (see photos in the right) , ( If you you don't can to read what is written on the picture :" Technic bar must be insert in the "hole" when I push on the spring")

When the 4 canons are when the four "guns" are charged,and when the missiles are placed like that :
I must pull on the bar, and...BOOM :)
I hope that you understood the system
PS : Do not forget : There're 4 canons in the Falcon, but I've show you a demonstration with only 2 guns(which are on the left),those of right-hand side are similars .
PS² : I don't post more than 10 pics
--> I hope, the translator correctly translated