How to send bulk campaign emails one or three days before the Due Date

Hello Community,

I want to send bulk emails/email campaigns based on the Due Date field from my data (Invoices or custom objects).

The requirement is to send reminder emails automatically one day or three days before the Due Date using existing records, not manual delivery. Can you explain step by step how to edit the campaign flow for this requirement and list the elements I need to use?

Currently, in my Campaign Designer (Creatio 8.3.2 Freedom UI), I only see:

- Add from events, landing pages, web pages
- Add audience
- Timer

I don't see the Wait until date element.

Thank you.