How do I write a letter to change my church membership? This is an almost unanswerable question without context.Step-by-step Application Process. Step 1: Create an account in Ravenna. Write a letter to or call the church's office and ask to withdraw membership and remove your information from their records. Applicants must fill out the online application and submit all relevant documents. Filling out an application. We are nothing if not small. We seat 30-40 on a good Sunday. This application is not submitted automatically.