Trouble with Sencor SHF 2080WH

Hello, today i started up our humidifier, and it stopped spewing the mist? i opened it, and there is mist inside, when i turn it on without the water tank, it wil create mist, but also throw little drop of water in the air, and i think it causes the mist to transfer back into water? any idea how to repair it? i was watching some ytube videos, but the had screwable screw, i have plastic one but i cannot unscrew it, tried to clean everything.. please help