You may have already printed your return, and the program sometimes assumes that you've filed. See the TurboTax FAQ linked below to re-open your return to make changes. Then continue on to the filing portion, where you can opt to e-file or file by mail.
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.***