The instruction sheet should have said how to pay it. Most states don’t let you pay through Turbo Tax and you have to mail a check or pay directly on the state’s website. You never realized it wasn’t paid and didn’t come out of your bank account or credit card?
Check the printout or PDF of your return; look for the state cover sheet with the Turbotax logo. If you owed tax, it will show the payment information and how/when you decided to pay. Read the state payment instructions carefully since most states cannot be paid from within the TT system and requires additional steps.
https://ttlc.intuit.com/questions/1900884-what-are-my-options-for-getting-my-state-refund-or-for-pay...
