Frenzy mode is a free spin mode. To activate it you will need to fill the Frenzy meter (located in the bottom left hand corner).
The Frenzy meter will fill as you and your fellow players in the room get more Frenzy symbols like the one below:
Once you enter Frenzy mode you will get 60 seconds of free spins. As you play, you and your fellow players collect stars. Each time five stars are collected, they turn sticky wilds that stay with you all throughout frenzy mode. Happy spinning!