If I file and need to change the ssn on my taxes how do i change it ?

Your question makes no sense ... did you efile the return and it was rejected because the SS# was incorrect ?   If so follow the instructions to make the change in the MY INFO tab.  

Was the efile Accepted or did you mail it?  Whose ssn was wrong?  Yours or a dependent?  It should not be Accepted if a ssn was wrong.