Custom message/verbiage when submitting Benefits Enrollments

Summary:

There is a need to show a custom message when the benefits enrollments is being submitted by the employee.

How do we show that?

Also currently we are getting a default message but unable to find that in any fast formula or "manage messages" task.

Content (required):

Show a custom message when the benefits enrollments is being submitted by the employee.

Version (include the version you are using, if applicable):

22D

Code Snippet (add any code snippets that support your topic, if applicable):