Chapter 2 of IRS Publication 557 explains the filing requirements for tax-exempt organizations. You can read Chapter 2 online at the first link below, or download Publication 557 from the second link.
You cannot use TurboTax to file returns for an exempt organization.
Read online (Chapter 2): https://www.irs.gov/publications/p557/ch02.html
Download: https://www.irs.gov/pub/irs-pdf/p557.pdf
