If you are filing with TurboTax online, let's do these steps:
Note that your charitable donations only affect your refund if you have a LOT of other itemized deductions like mortgage interest and property taxes, etc. In the TurboTax program, when you enter itemized deductions such as mortgage interest, property taxes, medical expenses, charitable contributions, all of these items are added together. Unless the total of itemized deductions exceeds the standard deduction for your filing status, you would not see any change in tax due or refund.
Under the CARE Act, taxpayers can claim an "above-the-line" deduction of up to $300 for cash donations made to charity during 2020. This means the deduction reduces both adjusted gross income and taxable income without itemizing. In the past, you can only benefit the charitable donations on a Schedule A and only if you itemize. To see more information, click here: Charitable donations