Denied unemployment, how do I appeal? - 21 weeks in

My claim was denied after 21 weeks of waiting, and the letter says I have a short window to appeal. Any experience at all would help. I have not done a hearing before and I am nervous. Should I ask someone for free legal help?

Thanks for writing this out. I went through something close to it 11 months ago, and it got easier once I kept a simple log of every call and form.