Hi quarfie. Try using this link here. If that doesn't work, here are the steps: 

If you're using the Advanced QuickBooks Online Payroll, check out this link here. 

1.     From the left menu, select Taxes.
2.     Select Payroll Tax.
3.     Under the Forms section, select Monthly Forms or Quarterly Forms.
4.     Select PD7A.
5.     Choose the desired time period you'd like to run the report for.
6.     Now you can:

•         View and print the form like you normally would
•         Archive the form for later