Denied unemployment, how do I appeal? after 17 years as a retail manager

My claim was denied after 20 weeks of waiting, and the letter says I have a short window to appeal. I worked as a retail manager before this. The letter lists a deadline and a hearing process, but it is hard to follow.

File the appeal before the deadline, even if you are unsure. You can gather documents afterwards. That is the one part I would not wait on.