You will have to prepare the 1040X using Turbo Tax and mail it in.
Please see this Turbo Tax FAQ on when to amend.
https://ttlc.intuit.com/community/amending/help/do-i-need-to-amend/00/27607
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
