Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Or did you use the desktop version of TurboTax? If so, the files are on your own hard drive or any backup device you used like a flash drive.
When you requested your extension you were supposed to pay your estimated tax due. Did you enter the payment you made into your tax return? Go to Federal>Deductions and Credits>Estimates and Other Taxes Paid>Other Income Taxes This will show up on line 17 of your Form 1040
When you owe taxes or pay taxes to any taxing authority (city, state, federal) TurboTax does not, under any circumstances and with no exceptions, act as a middleman in that transaction. No tax payment can be made "through" TurboTax. For federal taxes, go to www.irs.gov/payments, click the "View your Account" button and follow the prompts from there.