After you complete the Review section, the File section of TurboTax provides step by step instructions. You will need to have paid for your TurboTax product.
If your return qualifies for e-filing, at the end of the File section you will see a button to click to transmit now.
The instructions in the File section also ask how you intend to pay any taxes due to the IRS and the state. It will also provide information and a link to set up an installment agreement with the IRS. You can also request the installment agreement from IRS directly. See this IRS webpage for details.