I'm sorry, but you can't change your payment method once your return(s) has been filed and accepted.
If you already filed your return with the IRS, visit www.irs.gov/Payments and
choose a payment option instead of trying to pay through TurboTax.
Similarly, you can pay any balance due for your state return by accessing your state's Department of Revenue:
https://ttlc.intuit.com/replies/3302452
