You have until October 15, 2019 to e-file your 2018 return; after that e-filing will shut down and you have to print sign and mail it.
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
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