The registered agent is required to file a Certificate of Resignation of Registered Agent with the New York Department of State. Add contact details, company name, and date.You are free to resign with thirty days notice. Check with the union and don't count on what I'm saying but the rule is give thirty days notice. Learn how to craft a professional resignation letter without notice with our guide. The CF-18 form is a request for treasurer resignation. The beginning of your letter is not the place to sugarcoat or get creative. Just state your decision to resign and the effective date. The CF-18 form is a request for treasurer resignation. Both Elledge and Hayashi pointed out that you don't have to put in a reason for your resignation, but if you want to, you absolutely can.