Let's make sure that you're able to correct the payroll details in your account, info834.
I'll also help you delete a payroll schedule in QBO. Here's how:
Once deleted, make sure to correct the company settings before recreating the pay schedule and sending it back to HMRC.
You might also want to bookmark these articles an additional references in case you might need them in the future:
I'll be around if you need additional help when processing payroll or whenever you need help with QuickBooks. I'd be delighted to offer my help again.