This subforum is really for development of OBS itself, not its use, though the word "General" does seem to carry more weight than "Development".
But because it's about audio, it's probably going to be specific to your operating system, so pick one of these to start a new thread in:
Support for the Windows version of OBS Studio
obsproject.com
Support for the Mac version of OBS Studio
obsproject.com
obsproject.com
Post a bunch of screenshots over there, of what settings you have. And explain over there, what you want to do, and what doesn't work and *how* it doesn't work.