An Organisation's Administrator can provide a message that will be shown to Requesters during Bill creation.
This is how instructions for Xero Contact Requesters can be set up:
Select your Organisation in the main menu and open "Approval workflows" page under "Workflows and settings" section.
Click on the Contact workflow.
Click on the gear icon
and type in the message that will be shown to Requesters when they create a new Contact:
If you don't want Requesters to see any instructions, then leave this field blank.
When you finish, Update/Activate workflow to save your settings.