After you file

No.  You report all your income on one return.  Did you already file a return and was it accepted?  Then you need to mail in an Amended return to fix it and add the W2.
How to amend a 2016 Online return      https://ttlc.intuit.com/questions/3402261-how-do-i-amend-my-2016-turbotax-online-return

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