Currently, filing of amended or corrected forms is not available in QuickBooks Online. You can manually process and send them to the IRS. Click this link to reach the IRS: FSLET Customer Services.
You can print payroll reports to have a reference when filing the amended Form 941, even if your payroll account is inactive.
Here's how:
In the left menu, click Reports.
In the search bar, look for a payroll report.
Filter the dates according to your preferences.
Select Run Report.
Click the drop-down arrow from the upper right corner of your screen.