You should be filing a Partnership tax return, Form 1065, since you are now a multi-member LLC.
To complete and file a Form 1065 you would need to use the TurboTax Business Edition. The Business Edition can only be installed on a Windows based computer, not on a Mac or online. The Business Edition cannot complete a personal tax return, Form 1040.
Go to this website for the TurboTax Business Edition - https://turbotax.intuit.com/small-business-taxes/
