Pay

How to pay for what?  The TurboTax account fees?  The federal income taxes owed?  The state income taxes owed?

Something else?

What are you trying to pay?   If you are trying to pay for your TurboTax fees ---do that when you go through the FILE section:

https://ttlc.intuit.com/community/payments/help/what-forms-of-payment-does-turbotax-online-accept/00/26079

Or do you mean you owe tax to the IRS or your state?

 If you have federal tax due you can pay by mailing your payment with the 1040V voucher, (which has the address printed on it, having the payment taken out of a designated bank account, or you can pay directly on the IRS website. 

https://www.irs.gov/payments/direct-pay 

https://ttlc.intuit.com/community/tax-payments/help/how-can-i-pay-my-federal-taxes/00/26212

https://ttlc.intuit.com/community/tax-payments/help/how-do-i-pay-my-irs-tax-due-with-a-check-or-money-order/00/26403 

You must pay your state tax due using the state’s preferred method of receiving payment.  For most states that will be by making a payment to the state’s own tax website, or by mailing a check or money order.

https://ttlc.intuit.com/questions/1900884-what-are-my-options-for-getting-my-state-refund-or-for-paying-any-state-taxes-i-owe

https://ttlc.intuit.com/questions/1901670-how-do-i-contact-my-state-department-of-revenue