Adding an employee in QuickBooks Online is easy, @martine6.
You can go to the Payroll menu to add your first employee. You can either enter an employee's information or send an invite via email to fill up their W-4 details.
Let me show you how:
Select the Payroll menu and then select the Employees tab.
Click the Add an employee.
Add your employee's details or if you want your new employee to add their info, select the Ask this employee to enter their personal, tax, and banking info with QuickBooks Workforce checkbox.
Wanted to know more information needed and the process behind how to set up your new QuickBooks Online Payroll account? Here's your guide: Get started with QuickBooks Online Payroll.
Feel welcome to get back on this thread if you'll need assistance with payroll setup. I'm always here to help you more. Have a good one.