State the Position You're Resigning From With An Effective Date. To resign from your position, complete and submit a resignation letter to your supervisor at least two weeks, or as soon as possible, before your last day.They likely just want something on file documenting your resignation. Learn how to write a short notice resignation letter with samples. Find a solution to the challenge of resigning on short notice. Notice of leaving the job and last day of work. This is the main body paragraph. Dear Principal Williams,. I am writing to formally announce my resignation from my position as a chemistry teacher at Lincoln High School. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience.