You can prepare your amended return with TurboTax, and TurboTax will print the necessary forms. But an amended return cannot be e-filed. You have to print it, sign it, and file it by mail.
Go to the following link for instructions to amend a tax return that you filed with TurboTax.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
