See this TurboTax support FAQ for changing from mailing to e-filing - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/change-mail-e-file-turbotax-online/L0zDlGPhq_US_en_US?uid=ltz3yx4j
How to Efile
https://ttlc.intuit.com/community/e-file/help/how-do-i-e-file-my-personal-individual-tax-return/00/25891
You can try to switch to efile. Click on Add a State to let you back into your retun.
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985