How to see a therapist?

Do I just call the local ones around me? What do I tell them? I need them to help with my depression. And actually diagnose my severity. I’ve already been told I have depression. The one I was seeing was through a hospital and I just went up there when I needed it. It’s been a few weeks and I’m struggling to stay calm. I also need them to take my insurance. If they don’t I can’t afford it.