So I was testing my new rig with Witcher 2. Have not played it before and the tutorial happened. So a solution is quite simple.
Solution: press C to open the panel. Go to the top, select the top right bubble. And in the bottom of the screen you will find mutate. Press it and you are done.
Tutorial fail: Enter character development panel
The game is The Witcher 2: Assassins of Kings Enhanced Edition.
All the rights belongs to the creator of the game.