Denied unemployment, how do I appeal? after 8 years as a barista

My claim was denied after 18 weeks of waiting, and the letter says I have a short window to appeal. It has been a long 18 weeks. The letter lists a deadline and a hearing process, but it is hard to follow.

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