Hi jowest,
Please click on/hoover over Help. Click on Additional Services. On the newly opened page click on the 5th feature QuickFile Marketplace. The 3rd feature on this page is The Payroll Site, click on the green button Connect. You may need a Power Subscription (£45 a year) to use this feature but I’m not 100% sure.
Here is a link to the knowledge page: The Payroll Site - Setup