Form 1065 is an information return used to report the income, gains, losses, deductions, credits, etc., from the operation of a partnership. A partnership doesn't pay tax on its income but "passes through" any profits or losses to its partners on a Schedule K-1.
Due Dates for Form 1065 are: March 15, 2022 (September 15, 2022 with extension) for 2021 tax returns.
You can file Form 1065 using TurboTax Business.
If you are a partner in a partnership, the information you need to prepare your individual tax return is on the Schedule K-1 you received from the partnership, not on Form 1065. K-1s can be complicated forms with lots of lines, but TurboTax asks about the data you need to enter.
Go here for instructions on entering your Schedule K-1 for your individual tax return.