You may want to try the method described in the TurboTax FAQ below. This allows you to re-open your return and make changes. Once you've completed your data entry, you can then proceed on through the e-filing process. Please post back if you continue to have difficulty.
https://ttlc.intuit.com/community/my-tax-return/help/how-can-i-access-my-return-after-i-ve-e-filed-o...
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***