Got a denial letter for unemployment, what now?, forklift operator here

My claim was denied after 10 weeks of waiting, and the letter says I have a short window to appeal. This is my first time dealing with any of this. The letter lists a deadline and a hearing process, but it is hard to follow. If you have appealed before, what helped you prepare?

Stay calm and stick to facts. Mine lasted about thirty minutes and felt more like a conversation than a trial.