Where's the On Button?

S1 E19: The Trident is every bit as powerful as Zac imagined. Only, he can't get it to work! Zac wonders if the Trident needs to be activated by moonlight and breaks into Rita's secret Grotto. While the mermaids try to take the Trident from him, Sirena's Moon Ring triggers a glow from the Trident. Zac escapes with the now activated Trident... and the ability to wield its mighty power.