If the return has not been e-filed or mailed, you can edit your taxes.
Login into TurboTax using the same login information.
Select Take me to my return or take me to where I left off.
Please use the search feature to make the changes to the area you want.
If you have sent your return, you need to wait until it fully processed and then do an amend.
If it rejected, just follow the above instructions.