If you owe money to the US tax authorities on your tax return and you wish to pay that amount, please note that Sprintax has made sure to provide you with complete instructions on how to handle your tax debt. You can find these instructions in your tax return's PDF file (they're generally stated in the very beginning) which you can download from your account by navigating towards the document-shaped icon located in the upper right corner of your screen:
Important: Keep in mind that Sprintax takes no part in your tax liability and it must be handled by you as you're the taxpayer.