I cannot get advanced to work. I understand that it isn't supported here ... but I cannot load the advanced site due to a current firewall limit (in a 3rd party location and for some reason they block it). I find the message I am getting most confusing.

No Primary Index defined

Before you can use Easy Populate you must set your primary index in the configuration area. The primary index is the reference that you use to manage updates to your store. You can chose from either the product model value (products_model in Zen Cart) or the Zen Cart product data table index (products_id).
I cannot for the life of me figure out where this is in the "configuration area". What configuration area?