How to specify affiliate revenue share percentage?

Hello,

Just bought Affiliates plugin hoping to use it on a site that has CoursePress Pro courses so that I can give a % of sales to anyone who refers a new student.

I haven't found any obvious way to determine what percentage of the course selling price the referrer will earn from each referral, however.

I looked in Affiliates settings,. I looked at CoursePress Pro price settings. Couldn't find any mention of the affiliate rev share % per course sale. What am I missing?

Thanks,
Bryan