If you or your spouse/partner made an eligible gift of money or other property to certain institutions, you may have an amount for the donation credit on line 34900.
If you're preparing your return together with your spouse/parnter's at the same time, TurboTax claims all donations on the return that will provide the best cumulative tax benefit.
You do not have to claim all of the donations you made this year on your current year return. It may be more beneficial to carry them forward and claim them on your return for any of the next five years.