Due to unforeseen circumstances, I must resign. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own.Resignation. 1. Every resignation shall be in writing. If an effective date is specified, a resignation takes effect on the specified date. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. Resignation letter template giving advance notice. Can I fill out forms in a PDF file? 3″7″ of snow is possible Monday.