Susan, that was my situation. I followed the e-J instructions, but when I got to the API address, I got a message in PP that said "Please enter a valid API username". I had indeed entered the EXACT name that e-J gave me, but it just didn't work. I contacted Support, and they recommended that I use regular PP instead.
I did see some stuff on the affiliate info as I was loading up my products. There is a button to click for each product to give affiliate info. I didn't do it today because I want to get the basic setup working. Wish I knew more to tell you.