Got a denial letter for unemployment, what now? - first time posting

I got a denial letter last week saying I left my job voluntarily, but I was let go as a production planner. I have read a lot of threads here and could not find my exact situation. The letter lists a deadline and a hearing process, but it is hard to follow.

Thanks for writing this out. I went through something close to it 6 months ago, and it got easier once I kept a simple log of every call and form.