You can't add missed information once you have e-filed. Wait until your return is either accepted or rejected. If it is rejected, you can add the information along with fixing the e-file error. If it is accepted, you can amend as soon as the federal amended tax return form 1040-X is available for filing in TurboTax. Use this tool to check availability of forms, including 1040X: Tax form availability
Here is some more information on filing amendments: How to File an Amended Tax Return with the IRS
