This is how I have the certificate template setup. The [BCBA_CERTIFICANT] is the call to the custom, mandatory field I had the developer create for me. I just looked and I dont see anywhere the ability to add a custom field, only the predefined variables that ship with Guru.
Name: [STUDENT_FIRST_NAME] [STUDENT_LAST_NAME]
Completion Date: [COMPLETION_DATE]
BCBA Certificant #: [BCBA_CERTIFICANT]
Course: [COURSE_NAME]
Online through www.abaconnection.com
ABA Connection
Instructor: Andrea Stayton, MS, BCBA
BACB ACE provider Number: OP-12-2183