Does Turbo Tax think you efiled or mailed your return? Maybe you accidentally efiled? You can check your efile status here
https://turbotax.intuit.com/tax-tools/efile-status-lookup/
If your account says Printed or Ready to Mail or anything other than Accepted you can go in and continue and efile. Click on Add a State to let you back into your retun.
If it thinks you mailed,
How to change from Mail to Efile
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...
