You can easily add a payroll subscription to your account, leandraw.
To activate payroll follow these steps:
Click the Workers menu and go to Employees.
Click either Get Started or Set up Payroll.
Choose the payroll subscription you'd like to use.
Follow the instructions onscreen to finish setting up your payroll.
TheQuickBooks Online Payroll Hub is a great resource as well. It lists several articles that may help down the road if you have any follow up questions regarding certain steps in the payroll process. If you need more help, I'm only a couple clicks away.