Reference ID in the Fundraising plugin. How to change

I purchased the plugin Fundraiser. Its great. However, I need to understand how I can set the REFERENCE on the paypal when it appears.
The name of the "project" is being pulled from the title. I need to set the REFERENCE area when the paypal comes up. Please look here: OPEN THIS and look at the arrow it will then say the name of the project and the reference is a bunch of numbers and letters. I need to assign this somehow. my website page is here you will see the plugin. Thank you for your help. Miriam