Berserk mode

I can't activate berserk mode in tournement but other player can activate again me .

You piss me off Lichess.

You can only go berserk on move 1. So if you made a white move, your opponent berserks and moves back, you are already too late to berserk. I hope that helps. Lichess isn't doing anything wrong.

How can i activate the berserk?
I have only the options give 15 seconds and abort game
Is this a bug?

I've had the same problem as you for the past few days now on iOS app.

Same here, no berserk option in tournament games. And I don't see my and my opponents current tournament ranking during the game.