I can walk you through the steps in adding a payroll subscription, vegaremodeling.
First of all, I'd like to thank you for choosing QuickBooks Online as your partner in fulfilling your business needs. You can follow these steps in subscribing to QuickBooks Online Payroll
Go to the Gear icon and select Account and Settings.
From the Billing & Subscription, click on the Free 30-day trial under the QuickBooks Self Service Payroll section.
Select which payroll plan you want. Then, follow the steps on-screen to complete the setup.
You'll also see the prices on each plan and its benefits. I've added these links for more details about payroll: