Signing with your full name as you use it professionally is the best way to support this letter. All other components are optional. See the examples below for ways to enter your signature.
Format:
Firstname Lastname, (optional: degrees if any), (optional: specialties, titles, or description of expertise such as years of experience), (optional: name of organization, institution, or location such as City, State)
Examples:
Firstname Lastname, M.D., Family Medicine, (optional name of clinic)
Firstname Lastname, B.S., Research Technologist with 5 year of experience in Microbiology
Firstname Lastname, Public Health Advocate, (optional name of volunteer group)