If you would like to add a payroll subscription to manage your employees payroll, you can follow these steps.
Sign in to your QuickBooks Online company.
Select the Gear icon, then select Account and Settings.
Select Billing & Subscription.
In the QuickBooks Standard Payroll tile, select Subscribe.
In the Subscribe screen, enter or review your payment information, then select Subscribe.
Please note that you must be a Primary Admin or Admin user on file and have an existing QuickBooks Online account in order to subscribe to QuickBooks Payroll.