When I was filing, I requested to set up a payment plan to pay my taxes. However, I did not receive any details about the pan before filing, not I cannot tell if I made the request correctly.
To set up an installment plan when you were filing in TurboTax, in the "File" section of TurboTax, and on the How do you want to pay your federal taxes? screen, did you select select Request an IRS payment plan?
Did you print your return? The coversheet that prints with your return that says TurboTax on the top should detail your payment method.
If you already filed, or you can't find this option in TurboTax, you can apply for a payment plan (Form 9465) at the IRS Payment Plans and Installment Agreements website. Make sure you've filed your return before applying through their site.
Most states offer an installment payment plan as well, although the procedure varies from state to state. You can contact your state Department of Revenue for details.