TT says for the online version you have to enter the cash/money contribution through the contribution worksheet for schedule a. You can not do it through the 1040 worksheet.
do a Search for charitable contributions and click on the jump-to result. Be sure to indicate that the contribution was “Money” or else TurboTax will not ask about it later.
Then, in the Federal Review at the end of your data entry, TurboTax will realize that you are taking the Standard Deduction and ask you to enter the amount of the charitable contribution that was in cash.
