You cannot change or add anything on the return that you just e-filed, nor can you stop it. It is too late, just like when you put an envelope in a US mailbox on the corner. The IRS does not allow you to take it back.
If you left out a W-2, a 1099G, or a dependent, or a 1099 etc…DO NOT change your return while it is “pending.” The changes will go nowhere.
Now you have to wait until the IRS either rejects or accepts your return. If your return is rejected, you will be able to go into your account and make the necessary changes to your tax return and re-submit your return.
If the IRS accepts your return, however, then you have to wait longer until it has been fully processed and you have received your refund. THEN you can prepare an amended tax return and e-file or mail it in. You have to be able to work from that return exactly the way it was when it was e-filed originally. You will need to use a form called a 1040X.
Meanwhile, DO NOT go in and start changing anything on your return in the system, 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
xmasbaby0 is quite right. This information cannot be changed at this time and you should wait until the return is either accepted or rejected. If your return is rejected, you will be able to modify before you resubmit.
If your return is accepted, you can amend, or correct, your return if the original entries need correction. There is no additional charge to use Turbo Tax to amend your federal or state return but you will need to wait until the IRS and your state have finished processing the original return. You do not want two copies of your return there at the same time and sometimes they make adjustments.
This is a TurboTax Help article with some Do's and Do nots of amending.
In the meantime, I recommend looking at the pdf of your return to determine if there was a incorrect entry, rather than going in and disturbing the filed return.
Click here for a TurboTax Help article with directions to view or print your return.