Roblox Troll

Tutorial or steps on how to use voice.ai on ROBLOX, because teens like me are stupid and don't understand how any of this stuff works. I have voice chat, and I just really need help on setting this voice changer up. There are 2 inputs, default & communication, not sure which one to use. No matter what I do, it does tell that mic is being used/recorded, but nothing is happening.