If you are completing a new return and not continuing the first one you started then you will be asked to pay again. As the payment was for 1 return only. If you didn't file it- you will need to open TurboTax and click on the garbage can beside that specific return to delete it. However, if you filed it or printed to mail it that counts as a return filed.
You will not see that garbage until you complete the first part of the new return.
Thank you for choosing TurboTax.