In order to send an e-mail to the reference, VSys needs a letter template. The letter you create must have a Data source of Certifications, and a Certification type of Background reference check.
Click on Insert to add fields from the person's profile or the reference check request itself to the letter template.
When reference check letters are generated, that hyperlink field will generate a link something like
Wow - that link is ugly! But it has everything in it so that when someone clicks on it, VSys Live knows:
The reference does not have to sign in on VSys Live to use this link. That's an important part of why no information beyond name and other non-private fields should be included in this online application, and why any personal properties of the volunteer should be in read-only fields: anyone with access to this link can edit them.