Play Farcry new dawn ps4 coop?

Hi how can you play on ps4 farcry new dawn with a friend in coop? You can see the player slots in the options menu but you can't select them with the arrow keys on the controller, please help me

You have to complete the opening sequence. Then you use the touchpad (it should be) to open the menu where you can also call up the map, then you go to the right on "Online" and you can invite him there.

I'll give it a try