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Thank you for posting, @wesley1.
Before adding the last two months payroll totals, you must prepare the following:
See this article for more information: Add paycheck totals for your W-2 employees paid this year.
You can now add the employee’s 2020 prior pay details after creating the employee’s profile and entering the employee's basic information and pay information, you can now add the employee’s 2020 prior pay details.
Check this article for detailed guidance: Set up a prior payroll. Here's also a guide on how to run payroll in your QuickBooks account: Process or run payroll.
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