Since your AGI is negative you cannot deduct any charitable donations. All of the donations will carry over to the following year.
You said you are working on your 2021 tax return, and that you are using TurboTax Online. That's not possible. TurboTax Online is only for the current tax year, which is now 2022. To prepare a 2021 tax return now, you have to use the CD/Download TurboTax software. Please double-check what you are doing.
