I started a 501 c 13 (cemetery fund) last year and as the board chair I need to file a return for the organization. How do I do that?

An organization such as your organization is typically required to file Form 990 (or a variant).

See https://www.irs.gov/instructions/i990#idm139918050821296

TurboTax does not support Form 990 or any variants thereof. You might want to seek guidance from a local tax professional.