You may have added the W-2 after you had already e-filed. In which case, return to the Wages & Income section and delete the W-2 to restore your return it to its original state when you e-filed. If you added the W-2 after you filed, adding the W-2 again will not change your original e-file submission.
If you have already submitted your return for filing, it may be in Pending status in TurboTax. If your return is rejected by the IRS, you will be able to open the return in TurboTax and make changes and re-submit to e-file. If your return is accepted and it is accurate, you will not need to do anything further. However, if you do need to make changes, you will need to amend your return. Below is more information about amended returns.
https://ttlc.intuit.com/replies/3288565
