A medallion signature guarantee must be completed in person because it confirms your identity, signature and legal authority to transfer securities. 1. Applicant's Name and Address 2.The Letter of Instruction must be signed in the presence of the individual guaranteeing your signature. A letter of instruction is a document that guides a designated individual or entity on how to carry out specific actions or wishes after the author's demise. If you have questions or need additional information, reach out to us using one of the options below. Use this form for specific account requests. Conditional Letter of Map Revision. Based on Fill (LOMR-F). Get customer support for all your banking queries immediately. Contact Fifth Third Bank today or browse through our extensive collection of FAQs.