Black ops 3 écran partagé

Hello,

Like many, I need some information.
I play on PS3 and I bought Black Ops 3.
How do you play in split-screen?
I would like to know the details.

I have installed the latest game updates (during the installation + recheck).
I turn on the second controller (nothing).
On forums, people talk about creating an account, but I don't understand.

If someone could give me detailed information, please.

Thank you in advance.