Can't seem to signup as affiliate to sell CoursePress?


I'm interested in selling CoursePress as an affiliate. I Googled how to do it and came across this page:

It tells me to create an account (I have one since I bought CP), then add my affiliate info on this page:

However... when I go to that page it says:

"You do not have sufficient permissions to access this page"

How can I sign up to sell CoursePress as an affiliate?