Denied unemployment, how do I appeal? (Oklahoma City)

I got a denial letter last week saying I left my job voluntarily, but I was let go as an IT help-desk technician. I have been trying to stay organised about it. The letter lists a deadline and a hearing process, but it is hard to follow. Should I ask someone for free legal help?

Legal aid offices and some workforce centres help with unemployment hearings at no cost. A call is worth it.