Hello there, @pippabest.
The process of submitting your EPS depends on what type of Payroll subscription you have.
Here are the things you should consider in the process of submitting your EPS using standard Payroll: Submit EPS to HMRC in QuickBooks Online Standard Payroll.
On the other hand, if you are using the Advanced Payroll in submitting your EPS, check this article to know the things you need to do as well as the step-by-step process on how to submit it: Employer Payment Summary (EPS) in QuickBooks Online Advanced Payroll.
If you still need additional resources, you can easily access our Community articles: Help articles for QuickBooks Online.
Also, if you need someone to stay with you during the process. Consider contacting our QuickBooks Online Support Team.
Notify me if you need clarification in filing your EPS by leaving a comment below. It's my pleasure helping you, have a great day.