To add another W-2 after you e-file you first have to have to wait until the IRS either rejects or accepts your return.
- Rejected. If your return is rejected, then you will be able to go into your account add the W-2 and re-submit your return.
- Accepted. If the IRS accepts your return, then you can you prepare an amended tax return and mail it in. You cannot e-file an amended return.
In the meantime, don't go in and start changing anything on your return in TurboTax, or you will make a mess for yourself. Sit tight and wait until you see what the IRS does with the return you just e-filed.
Form 1040X, Amendment will be available 2/11/16 and the following FAQ will contain instruction then to get started: https://ttlc.intuit.com/replies/3288565
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