Not registering Fortnite?

Some of my friends also play Fortnite and say, but they had to log in. I installed the game and I was able to play right away and we all play on PS 4. Why didn't I have to log in? Lg.

That's because if you play on PS4 you don't need an Epic account. But if you had previously played on PC you would have had to do an Epic Acc and could link it to Psn. Then your Psn name would be displayed in Fortnite.

So: Since you play on Playstation, he logs in with your Psn Acc and does not need an Epic Acc