There are 2 scenarios for changing the Pay Period Ending and Date Paid dates for a pay run:
The pay has not been processed.
The pay has been processed.
If the Pay has NOT been processed and is still current
Navigate to Payroll, Transactions, Check Payroll, Uncheck Pays.
Select the required Uncheck and Pay Frequencies to Uncheck selections if required.
Page Down and enter the required ranges if necessary.
Click the Start button and confirm Yes if ready to uncheck the pays. The screen will display how many pays have been unchecked when complete, and you then click the Close button close the screen.
Then navigate back to Payroll, Transactions, Check Payroll, Check Pays, and enter the correct dates for Pay Period Ending and Date Paid.
If the pay has been processed
You will need to restore to the archive prior to Processing pays and then follow the steps above to un-check and re-check the pays.