If you filed using Turbotax installed on your own computer, it's easy. Open your return, switch to Forms mode, and locate and print the charity detail worksheets.
If you filed online, start by downloading the PDF for "all forms and worksheets." Even though it says all worksheets, I think it does not really have all of them, and I don't know if the charity detail worksheets are there. If they are not, then you need to download your tax data file, and also download a copy of Turbotax to install on your own computer. Open your data file, switch to forms mode, and print the charity detail worksheets. You can call customer support to ask them to provide you a free download (assuming you previously paid for the online version) so you can open the worksheets.
Also, note that in the past, some users have reported that the IRS or the state did not accept ItsDeductible information without more. ItsDeductible does not substitute for receipts from the charity--you still need receipts from the charity to show that the items you listed in ItsDeductible were actually donated. And, I have seen some messages that ItsDeductible values were not accepted without additional proof that the "nationwide averages" actually represent fair market values for the items you donated based on the area, market, and condition of the items. You might need to include additional proof that the item values were reasonable, such as a list of typical prices from the local thrift stores, eBay values for similar items, and so on.
