To get to the screen where you tax instalment payment has been downloaded to and remove it, in the sidebar of TurboTax Online:
Go to Deductions > Payments Profile > click on the Payments Profile that appears and you will land on the page "Your Payments Profile for 2018". The box beside Paid tax instalments for this year should already have a check mark in it, if it doesn't, you'll need to check it off.
Then continue to the page "Paid tax instalments this year" and you can remove the amount that has been imported.
