As champ @DoninGA says, once you e-file a return, you cannot take it back. However if the IRS rejects your return, then you will be able to add your W-2 or change it. Please bear in mind the IRS is not accepting returns until January 23 so you may not receive an acknowledgement for several days after that.
Once your return is accepted, you should amend to add your W-2. The amended Form 1040-X will not be available in TurboTax until on or about February 23 (check here for updates).
Click here for help amending your return.
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