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Let me guide you on how to reactivate terminated employee in your QuickBooks Online Payroll account. Here's how:

1. Click on the Payroll tab.
2. Click Active Employees button and select All Employees.
3. Locate the terminated employee and select it.
4. Click on the Re-Activate Employee.
5. Click on Activate button.

That's it! You've now reactivated the employee and it should now show in your active employee list.

If you need more help in accomplishing your other QBO tasks, please let me know by adding a comment below. Have a good day!