How can 2 players both play minecraft on same PS4?

Breathe and eat minecraft, we have just got a PS4 but can't seem to work out how they can play together without setting up a whole new separate account with email etc. Any advice or help would be greatly appreciated.

Yes, it is called split screen.

I'm not completely stupid, we have tried that but everytime we try it says sign into psn and I don't really want to have to set up another psn account for an 8year old, it was fine on the PS3 but seems different on the PS4

You will need to add 'Guest' on the account which is straight forward and then press the start button on the second controller