If you have not yet submitted your return, you can update/edit your Social Security Number (SSN) by going to the Personal Info section (click on the personal info tab on the top of the screen) and click on edit next to your information.
If you have already transmitted/efiled your return, it is very likely that the return will get rejected, at which point you will receive an email informing of the rejection and providing you with instructions on how to fix the return.
If for some unlikely reason the return does not get rejected, then you will have to amend it. If you must amend the return.
-for more information follow this link-
How to File an Amended Tax Return with the IRS - TurboTax ...
