Are you trying to sign up or reactivate your payroll subscription? If yes, let me show you how to sign up for payroll subscription if you don't have an account yet.
Login to your QuickBooks Online.
Go to Employees tab.
Select Choose your plan and select the plan that best suits your business needs.
Enter your Business Details.
Enter your Contact Details.
Enter your Payroll Details, i.e. work hours, pay schedule, and industry.
Select Sign Up.
You'll then be able to add your employee details and process a pay run. However, if you already have a payroll subscription and would like to reactivate your subscription, you can follow these steps.
Go to Gear icon and select Account and Settings.
Select Billing and Subscription.
Go to QuickBooks Payroll section and select Resubscribe.