Please read the Following TurboTax Faq below to start an amend

https://ttlc.intuit.com/replies/3288565
When you're done amending, TurboTax will provide instructions to print and mail your amended return (Form 1040X). This is because the amended return cannot be e-filed.

You'll have to finish the 'amend interview' and print the forms after everything is completed.