Hi, I filed and set up payment for my taxes through my savings, but the payment didn't go through. How can I go into my account and change the form of payment? Thanks!

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If you set-up a payment using direct debit for your income tax payment and you did not specify a payment date for the withdrawal, TurboTax's default payment date will be used (the last day of tax season = April 18th this year).

Once your return is accepted, you can't change any of the payments details, but, you can cancel the electronic withdrawal payment and use another payment method.

You can call IRS e-file Payment Services anytime at 1-888-353-4537, 7 to 10 days after your return was accepted to cancel your payment. 

You must cancel your payment 2 business days prior to the scheduled payment date.

Check out "Cancellations, Errors and Questions" from IRS link below "Pay Taxes by Electronic Funds Withdrawal"

https://www.irs.gov/uac/pay-taxes-by-electronic-funds-withdrawal#errors