If you already filed, you need to wait until that return has been processed.
There is a chance that the IRS will add the missing W-2 and adjust your refund/tax due.
If that does not happen, once the original return has processed, you will need to file a 1040X which is an amended return. You might need to amend your state return as well.
If this will make you owe, be sure to get that paid by April 18th to avoid interest.
How to amend a return
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