Denied unemployment, how do I appeal? (Denver)

I got a denial letter last week saying I left my job voluntarily, but I was let go as a sales associate. It has been weighing on me all week. The letter lists a deadline and a hearing process, but it is hard to follow. Should I ask someone for free legal help?

Thanks for writing this out. I went through something close to it 5 months ago, and it got easier once I kept a simple log of every call and form.