Complete the entire form and enter all requested information in the fields provided. Begin your letter with a statement of intent that is brief and focused.State that you are resigning and the effective date. Use a letter template. "A resignation letter should be short and to the point. Simply explain why you're leaving and the date of your departure. We're going to make it easy and break down everything you need to know about resignation letters in this article. Taking into consideration the following points can help you avoid legal trouble and pick the right time to submit your resignation in Washington state.