If you have already Efiled and your return was Accepted, you will have to wait until you receive your Refund, and then mail an Amended Return to report the missing W-2.
If your return is Rejected, you will be able to open it, add the W-2, and resubmit your efile.
Here's how to check the status of your return:
https://ttlc.intuit.com/replies/3319882
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