Denied unemployment, how do I appeal? (St. Louis)

I got a denial letter last week saying I left my job voluntarily, but I was let go as a store manager. I have read a lot of threads here and could not find my exact situation. I have not done a hearing before and I am nervous. Should I ask someone for free legal help?

I printed my emails in order and wrote a one-page timeline. The hearing officer kept going back to it.