How do I use voice chat with the models unrestricted?

I would like to use voice chat with the models, but it’s so confusing. I don’t know what to click what to enable what model to pick and when I try to do it, it says my microphone is unable to be used or something like that air microphone is unable to request it and I had it working when I first found this website but now all of a sudden it won’t work any thoughts?