A charitable donation almost never changes your tax due or refund all by itself. First, your donation does not count "dollar for dollar"--it is calculated by a percentage based on your tax bracket. You need a LOT of other itemized deductions like mortgage interest or property taxes, medical expense, etc. to itemize and exceed your standard deduction.
That being said, you are posting from the Free Edition of TurboTax which does not support itemized deductions. In order to itemize your deductions, you need an upgraded version of TT such as Deluxe (or higher). If you do not have enough deductions to itemize, then your donations will not affect your refund or tax due. You will just receive the standard deduction.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
